Revert "for dev branch"

This reverts commit 32615af18b.

Tests/Statistics/PSDEV_Test.cs

@@ -9,7 +9,7 @@ public class PSDEV_Test
 	public void Add_Test()
 	{
 		TSeries a = new() { 0, 1, 2, 3, 4, 5 };
-		PSDEV_Series c = new(a, 3);
+		SDEV_Series c = new(a, 3);
 		Assert.Equal(6, c.Count);
 		a.Add(5);
 		Assert.Equal(a.Count, c.Count);
@@ -21,7 +21,7 @@ public class PSDEV_Test
 	public void Edge_Test()
 	{
 		TSeries a = new() { double.NaN, double.Epsilon, double.PositiveInfinity, double.MaxValue };
-		PSDEV_Series c = new(a, 3);
+		SDEV_Series c = new(a, 3);
 		Assert.Equal(a.Count, c.Count);
 		a.Add(double.NaN);
 		Assert.Equal(a.Count, c.Count);

Tests/Statistics/SDEV_Test .cs

@@ -9,7 +9,7 @@ public class SDEV_Test
 	public void Add_Test()
 	{
 		TSeries a = new() { 0, 1, 2, 3, 4, 5 };
-		SDEV_Series c = new(a, 3);
+		SSDEV_Series c = new(a, 3);
 		Assert.Equal(6, c.Count);
 		a.Add(5);
 		Assert.Equal(a.Count, c.Count);
@@ -21,7 +21,7 @@ public class SDEV_Test
 	public void Edge_Test()
 	{
 		TSeries a = new() { double.NaN, double.Epsilon, double.PositiveInfinity, double.MaxValue };
-		SDEV_Series c = new(a, 3);
+		SSDEV_Series c = new(a, 3);
 		Assert.Equal(a.Count, c.Count);
 		a.Add(double.NaN);
 		Assert.Equal(a.Count, c.Count);

Tests/Validations/TA_LIB.cs

@@ -28,7 +28,16 @@ public class TA_LIB
 		this.involume = this.bars.Volume.v.ToArray();
 	}
 
-/////////////////////////////////////////
+	/////////////////////////////////////////
+
+	[Fact]
+	public void SDEV()
+	{
+		SDEV_Series QL = new(this.bars.Close, this.period, false);
+		Core.StdDev(this.inclose, 0, this.bars.Count - 1, this.TALIB, out int outBegIdx, out _, this.period);
+
+		Assert.Equal(Math.Round(this.TALIB[this.TALIB.Length - outBegIdx - 1], 8), Math.Round(QL.Last().v, 8));
+	}
 
 	[Fact]
 	public void SMA()