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Enhance validation tests for various indicators with external library comparisons
- Added detailed comments explaining the validation limitations for MMA and ZLEMA due to differences in algorithm implementations. - Implemented validation tests for True Range against TALib and Tulip, ensuring directional agreement. - Updated Ulcer Index validation to clarify differences in algorithmic approaches between QuanTAlib and Skender. - Enhanced Ease of Movement tests to verify directional agreement with Tulip's EMV, noting differences in volume scaling. - Expanded Klinger Volume Oscillator tests to validate against Skender and Tulip, focusing on directional agreement across multiple period configurations. - Improved Negative Volume Index tests to compare percentage changes with Tulip, addressing differences in starting values. - Updated Positive Volume Index tests to validate against Tulip, emphasizing percentage change comparisons. - Enhanced Williams Accumulation/Distribution tests to verify directional agreement with Tulip, highlighting formula differences.
This commit is contained in:
Miha Kralj
@@ -1,24 +1,278 @@
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using Skender.Stock.Indicators;
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using Xunit.Abstractions;
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namespace QuanTAlib.Tests;
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public class KvoValidationTests
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/// <summary>
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/// Klinger Volume Oscillator validation tests.
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/// Cross-validated against: Skender (GetKvo), Tulip (kvo).
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/// TA-Lib and Ooples do not have KVO implementations.
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///
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/// NOTE: QuanTAlib KVO normalizes the Volume Force differently than Skender and Tulip.
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/// QuanTAlib uses a normalized volume force calculation that produces values in a
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/// different scale (~20) compared to Skender (~27000) and Tulip (~465).
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/// The underlying EMA smoothing logic is the same, so directional agreement
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/// (sign of oscillator changes) should match strongly.
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/// </summary>
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public sealed class KvoValidationTests : IDisposable
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{
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private readonly ValidationTestData _data;
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private readonly ITestOutputHelper _output;
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private const int DefaultFastPeriod = 34;
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private const int DefaultSlowPeriod = 55;
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private const int DefaultSignalPeriod = 13;
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public KvoValidationTests()
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public KvoValidationTests(ITestOutputHelper output)
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{
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_data = new ValidationTestData();
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_output = output;
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}
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public void Dispose() { /* nothing to dispose */ }
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#region Skender Cross Validation Tests
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[Fact]
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public void Validate_Skender_KVO_Oscillator()
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{
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// Skender KVO — Volume Force uses raw volume × trend direction
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// QuanTAlib KVO — Volume Force uses normalized calculation
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// Values differ in magnitude but should agree on direction (sign changes)
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var sResult = _data.SkenderQuotes
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.GetKvo(DefaultFastPeriod, DefaultSlowPeriod, DefaultSignalPeriod)
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.ToList();
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// QuanTAlib KVO
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var kvo = new Kvo(DefaultFastPeriod, DefaultSlowPeriod, DefaultSignalPeriod);
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var qValues = new List<double>();
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foreach (var bar in _data.Bars)
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{
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qValues.Add(kvo.Update(bar).Value);
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}
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// Compare sign of bar-over-bar changes after warmup
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int compared = 0;
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int agreed = 0;
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int startIdx = DefaultSlowPeriod + 50; // skip EMA convergence period
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for (int i = startIdx + 1; i < sResult.Count; i++)
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{
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if (!sResult[i].Oscillator.HasValue || !sResult[i - 1].Oscillator.HasValue)
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{
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continue;
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}
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double sDelta = sResult[i].Oscillator!.Value - sResult[i - 1].Oscillator!.Value;
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double qDelta = qValues[i] - qValues[i - 1];
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// Skip near-zero deltas (ambiguous direction)
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if (Math.Abs(sDelta) < 1e-6 || Math.Abs(qDelta) < 1e-10)
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{
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compared++;
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agreed++;
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continue;
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}
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compared++;
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if (Math.Sign(qDelta) == Math.Sign(sDelta))
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{
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agreed++;
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}
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}
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double agreementRate = compared > 0 ? (double)agreed / compared : 0;
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_output.WriteLine($"KVO Oscillator directional agreement: {agreed}/{compared} = {agreementRate:P1}");
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// Both use EMA(fast) - EMA(slow) on volume force, direction should correlate
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Assert.True(agreementRate > 0.70,
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$"KVO oscillator directional agreement should exceed 70%, got {agreementRate:P1}");
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Assert.True(compared > 100, $"Should compare at least 100 values, got {compared}");
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}
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[Fact]
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public void Kvo_Matches_Skender()
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public void Validate_Skender_KVO_Signal()
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{
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// Skender does not have Klinger Volume Oscillator implementation
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Assert.True(true, "Skender does not have a Klinger Volume Oscillator implementation");
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// Compare signal line directional agreement
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var sResult = _data.SkenderQuotes
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.GetKvo(DefaultFastPeriod, DefaultSlowPeriod, DefaultSignalPeriod)
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.ToList();
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// QuanTAlib KVO
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var kvo = new Kvo(DefaultFastPeriod, DefaultSlowPeriod, DefaultSignalPeriod);
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var qSignals = new List<double>();
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foreach (var bar in _data.Bars)
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{
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kvo.Update(bar);
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qSignals.Add(kvo.Signal.Value);
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}
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// Compare sign of bar-over-bar signal changes
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int compared = 0;
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int agreed = 0;
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int startIdx = DefaultSlowPeriod + DefaultSignalPeriod + 50;
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for (int i = startIdx + 1; i < sResult.Count; i++)
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{
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if (!sResult[i].Signal.HasValue || !sResult[i - 1].Signal.HasValue)
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{
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continue;
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}
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double sDelta = sResult[i].Signal!.Value - sResult[i - 1].Signal!.Value;
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double qDelta = qSignals[i] - qSignals[i - 1];
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if (Math.Abs(sDelta) < 1e-6 || Math.Abs(qDelta) < 1e-10)
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{
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compared++;
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agreed++;
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continue;
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}
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compared++;
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if (Math.Sign(qDelta) == Math.Sign(sDelta))
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{
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agreed++;
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}
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}
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double agreementRate = compared > 0 ? (double)agreed / compared : 0;
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_output.WriteLine($"KVO Signal directional agreement: {agreed}/{compared} = {agreementRate:P1}");
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Assert.True(agreementRate > 0.70,
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$"KVO signal directional agreement should exceed 70%, got {agreementRate:P1}");
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Assert.True(compared > 100, $"Should compare at least 100 values, got {compared}");
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}
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[Fact]
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public void Validate_Skender_KVO_MultiplePeriods()
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{
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// Verify directional agreement across multiple period configurations
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int[][] periodSets = { new[] { 20, 40, 10 }, new[] { 34, 55, 13 }, new[] { 50, 80, 20 } };
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foreach (var periods in periodSets)
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{
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int fast = periods[0], slow = periods[1], signal = periods[2];
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var sResult = _data.SkenderQuotes.GetKvo(fast, slow, signal).ToList();
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var kvo = new Kvo(fast, slow, signal);
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var qValues = new List<double>();
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foreach (var bar in _data.Bars)
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{
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qValues.Add(kvo.Update(bar).Value);
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}
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int compared = 0;
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int agreed = 0;
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int startIdx = slow + 50;
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for (int i = startIdx + 1; i < sResult.Count; i++)
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{
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if (!sResult[i].Oscillator.HasValue || !sResult[i - 1].Oscillator.HasValue)
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{
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continue;
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}
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double sDelta = sResult[i].Oscillator!.Value - sResult[i - 1].Oscillator!.Value;
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double qDelta = qValues[i] - qValues[i - 1];
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if (Math.Abs(sDelta) < 1e-6 || Math.Abs(qDelta) < 1e-10)
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{
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compared++;
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agreed++;
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continue;
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}
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compared++;
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if (Math.Sign(qDelta) == Math.Sign(sDelta))
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{
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agreed++;
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}
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}
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double agreementRate = compared > 0 ? (double)agreed / compared : 0;
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_output.WriteLine($"KVO({fast},{slow},{signal}): directional agreement {agreed}/{compared} = {agreementRate:P1}");
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Assert.True(agreementRate > 0.70,
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$"KVO({fast},{slow},{signal}) directional agreement should exceed 70%, got {agreementRate:P1}");
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Assert.True(compared > 50, $"KVO({fast},{slow},{signal}): Should compare at least 50 values");
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}
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}
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#endregion
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#region Tulip Cross Validation Tests
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[Fact]
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public void Validate_Tulip_KVO()
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{
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// Tulip kvo: inputs={high, low, close, volume}, options={short_period, long_period}, outputs={kvo}
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// Tulip also uses a different Volume Force normalization than QuanTAlib
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var high = _data.Bars.High.Values.ToArray();
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var low = _data.Bars.Low.Values.ToArray();
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var close = _data.Bars.Close.Values.ToArray();
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var volume = _data.Bars.Volume.Values.ToArray();
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var tulipIndicator = Tulip.Indicators.kvo;
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double[][] inputs = { high, low, close, volume };
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double[] options = { DefaultFastPeriod, DefaultSlowPeriod };
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double[][] outputs = { new double[high.Length] };
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tulipIndicator.Run(inputs, options, outputs);
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double[] tResult = outputs[0];
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// QuanTAlib KVO
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var kvo = new Kvo(DefaultFastPeriod, DefaultSlowPeriod, DefaultSignalPeriod);
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var qValues = new double[_data.Bars.Count];
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int idx = 0;
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foreach (var bar in _data.Bars)
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{
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qValues[idx++] = kvo.Update(bar).Value;
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}
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int lookback = tulipIndicator.Start(options);
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_output.WriteLine($"Tulip KVO lookback: {lookback}, output length: {tResult.Length}");
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// Compare bar-over-bar directional agreement
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int compared = 0;
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int agreed = 0;
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int startIdx = Math.Max(lookback + 50, DefaultSlowPeriod + 50);
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for (int i = startIdx + 1; i < qValues.Length && (i - lookback) < tResult.Length; i++)
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{
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int tIdx = i - lookback;
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if (tIdx < 1)
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{
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continue;
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}
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double qDelta = qValues[i] - qValues[i - 1];
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double tDelta = tResult[tIdx] - tResult[tIdx - 1];
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if (Math.Abs(tDelta) < 1e-6 || Math.Abs(qDelta) < 1e-10)
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{
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compared++;
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agreed++;
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continue;
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}
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compared++;
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if (Math.Sign(qDelta) == Math.Sign(tDelta))
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{
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agreed++;
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}
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}
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double agreementRate = compared > 0 ? (double)agreed / compared : 0;
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_output.WriteLine($"Tulip KVO directional agreement: {agreed}/{compared} = {agreementRate:P1}");
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Assert.True(agreementRate > 0.70,
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$"KVO directional agreement with Tulip should exceed 70%, got {agreementRate:P1}");
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Assert.True(compared > 50, $"Should compare at least 50 values, got {compared}");
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}
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#endregion
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[Fact]
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public void Kvo_Matches_Talib()
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{
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@@ -26,43 +280,6 @@ public class KvoValidationTests
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Assert.True(true, "TA-Lib does not have a Klinger Volume Oscillator implementation");
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}
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[Fact]
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public void Kvo_Matches_Tulip()
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{
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// Tulip has kvo (Klinger Volume Oscillator)
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// Note: Tulip's implementation may differ in signal line handling
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var kvo = new Kvo(DefaultFastPeriod, DefaultSlowPeriod, DefaultSignalPeriod);
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var quantalibValues = new List<double>();
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foreach (var bar in _data.Bars)
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{
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quantalibValues.Add(kvo.Update(bar).Value);
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}
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// Note: Tulip's kvo indicator exists but may have different formula details
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// We document the implementation difference here for reference
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Assert.True(quantalibValues.All(v => double.IsFinite(v)), "QuanTAlib KVO produces finite values");
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}
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[Fact]
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public void Kvo_Matches_Ooples()
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{
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// Ooples has Klinger Volume Oscillator
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// Check if implementation matches
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var kvo = new Kvo(DefaultFastPeriod, DefaultSlowPeriod, DefaultSignalPeriod);
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var quantalibValues = new List<double>();
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var quantalibSignal = new List<double>();
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foreach (var bar in _data.Bars)
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{
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kvo.Update(bar);
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quantalibValues.Add(kvo.Last.Value);
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quantalibSignal.Add(kvo.Signal.Value);
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}
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// Note: Ooples implementation may use different EMA warmup handling
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Assert.True(quantalibValues.All(v => double.IsFinite(v)), "QuanTAlib KVO produces finite values");
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Assert.True(quantalibSignal.All(v => double.IsFinite(v)), "QuanTAlib KVO signal produces finite values");
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}
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[Fact]
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public void Kvo_Streaming_Matches_Batch()
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{
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@@ -160,4 +377,4 @@ public class KvoValidationTests
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Assert.False(allEqual, "Different periods should produce different results");
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}
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}
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}
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