v1.0.26

- Fix:
  - `IterableNumExtension.standardDeviation`.
  - `IterableDoubleExtension.standardDeviation`.
  - `DecimalOnIterableDecimalExtension.standardDeviation`.
  - `DynamicIntOnIterableDynamicNumberExtension.standardDeviation`.

- sdk: '>=2.14.0 <4.0.0'
- intl: ^0.18.1
- dependency_validator: ^3.2.3

CHANGELOG.md

@@ -1,6 +1,10 @@
 ## 1.0.26
 
-- Fix `IterableNumExtension.standardDeviation`.
+- Fix:
+  - `IterableNumExtension.standardDeviation`.
+  - `IterableDoubleExtension.standardDeviation`.
+  - `DecimalOnIterableDecimalExtension.standardDeviation`.
+  - `DynamicIntOnIterableDynamicNumberExtension.standardDeviation`.
 
 - sdk: '>=2.14.0 <4.0.0'
 - intl: ^0.18.1

lib/src/statistics_decimal.dart

@@ -1666,7 +1666,7 @@ extension DecimalOnIterableDecimalExtension on Iterable<Decimal> {
 
     var average = mean;
 
-    var first = itr.current;
+    var first = itr.current - average;
     var total = first * first;
 
     while (itr.moveNext()) {

lib/src/statistics_dynamic_int.dart

@@ -1610,7 +1610,7 @@ extension DynamicIntOnIterableDynamicNumberExtension
 
     var average = mean;
 
-    var first = itr.current;
+    var first = itr.current - average;
     var total = first * first;
 
     while (itr.moveNext()) {
@@ -1690,7 +1690,7 @@ extension DynamicIntOnIterableDynamicIntExtension on Iterable<DynamicInt> {
 
     var average = mean;
 
-    var first = itr.current;
+    var first = itr.current - average;
     var total = first * first;
 
     while (itr.moveNext()) {

lib/src/statistics_extension_num.dart

@@ -439,7 +439,7 @@ extension IterableDoubleExtension on Iterable<double> {
 
     var average = mean;
 
-    var first = itr.current;
+    var first = itr.current - average;
     var total = first * first;
 
     while (itr.moveNext()) {
@@ -731,7 +731,7 @@ extension IterableIntExtension on Iterable<int> {
 
     var average = mean;
 
-    var first = itr.current;
+    var first = itr.current - average;
     var total = (first * first).toDouble();
 
     while (itr.moveNext()) {

test/statistics_extension_num_test.dart

@@ -266,8 +266,8 @@ void main() {
     test('standardDeviation', () {
       expect(<int>[].standardDeviation, equals(0));
       expect([0].standardDeviation, equals(0));
-      expect([10].standardDeviation, equals(10));
-      expect([10, 20].standardDeviation, equals(7.905694150420948));
+      expect([10].standardDeviation, equals(0));
+      expect([10, 20].standardDeviation, equals(5));
       expect(<int>[10, 20, 30].standardDeviation, equals(8.16496580927726));
     });
 
@@ -551,8 +551,8 @@ void main() {
     test('standardDeviation', () {
       expect(<double>[].standardDeviation, equals(0));
       expect(<double>[0.0].standardDeviation, equals(0));
-      expect(<double>[10.0].standardDeviation, equals(10));
-      expect(<double>[10.0, 20.0].standardDeviation, equals(7.905694150420948));
+      expect(<double>[10.0].standardDeviation, equals(0));
+      expect(<double>[10.0, 20.0].standardDeviation, equals(5));
       expect(<double>[10.0, 20.0, 30.0].standardDeviation,
           equals(8.16496580927726));
     });