clean code fixes

lib/statistics/Variance.cs

@@ -9,7 +9,8 @@ namespace QuanTAlib;
 /// variance based on the isPopulation parameter. It uses a circular buffer
 /// to efficiently manage the data points within the specified period.
 /// </remarks>
-public class Variance : AbstractBase {
+public class Variance : AbstractBase
+{
     private readonly int Period;
     private readonly bool IsPopulation;
     private readonly CircularBuffer _buffer;
@@ -25,8 +26,10 @@ public class Variance : AbstractBase {
     /// <exception cref="ArgumentOutOfRangeException">
     /// Thrown when period is less than 2.
     /// </exception>
-    public Variance(int period, bool isPopulation = false) : base() {
-        if (period < 2) {
+    public Variance(int period, bool isPopulation = false)
+    {
+        if (period < 2)
+        {
             throw new ArgumentOutOfRangeException(nameof(period), "Period must be greater than or equal to 2.");
         }
         Period = period;
@@ -46,7 +49,8 @@ public class Variance : AbstractBase {
     /// <param name="isPopulation">
     /// A flag indicating whether to calculate population (true) or sample (false) variance.
     /// </param>
-    public Variance(object source, int period, bool isPopulation = false) : this(period, isPopulation) {
+    public Variance(object source, int period, bool isPopulation = false) : this(period, isPopulation)
+    {
         var pubEvent = source.GetType().GetEvent("Pub");
         pubEvent?.AddEventHandler(source, new ValueSignal(Sub));
     }
@@ -54,7 +58,8 @@ public class Variance : AbstractBase {
     /// <summary>
     /// Initializes the Variance instance by clearing the buffer.
     /// </summary>
-    public override void Init() {
+    public override void Init()
+    {
         base.Init();
         _buffer.Clear();
     }
@@ -63,8 +68,10 @@ public class Variance : AbstractBase {
     /// Manages the state of the Variance instance based on whether a new value is being processed.
     /// </summary>
     /// <param name="isNew">Indicates whether the current input is a new value.</param>
-    protected override void ManageState(bool isNew) {
-        if (isNew) {
+    protected override void ManageState(bool isNew)
+    {
+        if (isNew)
+        {
             _lastValidValue = Input.Value;
             _index++;
         }
@@ -83,13 +90,15 @@ public class Variance : AbstractBase {
     /// where x is each value, mean is the average of all values, and n is the number of values.
     /// If there's only one value in the buffer, the method returns 0.
     /// </remarks>
-    protected override double Calculation() {
+    protected override double Calculation()
+    {
         ManageState(Input.IsNew);
 
         _buffer.Add(Input.Value, Input.IsNew);
 
         double variance = 0;
-        if (_buffer.Count > 1) {
+        if (_buffer.Count > 1)
+        {
             var values = _buffer.GetSpan().ToArray();
             double mean = values.Average();
             double sumOfSquaredDifferences = values.Sum(x => Math.Pow(x - mean, 2));