mirror of
https://github.com/ncruces/go-sqlite3.git
synced 2026-01-12 14:09:13 +00:00
82 lines
1.4 KiB
Go
82 lines
1.4 KiB
Go
package stats
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import (
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"math"
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"testing"
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)
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func Test_welford(t *testing.T) {
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t.Parallel()
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var s1, s2 welford
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s1.enqueue(4)
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s1.enqueue(7)
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s1.enqueue(13)
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s1.enqueue(16)
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if got := s1.average(); got != 10 {
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t.Errorf("got %v, want 10", got)
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}
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if got := s1.var_samp(); got != 30 {
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t.Errorf("got %v, want 30", got)
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}
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if got := s1.var_pop(); got != 22.5 {
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t.Errorf("got %v, want 22.5", got)
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}
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if got := s1.stddev_samp(); got != math.Sqrt(30) {
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t.Errorf("got %v, want √30", got)
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}
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if got := s1.stddev_pop(); got != math.Sqrt(22.5) {
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t.Errorf("got %v, want √22.5", got)
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}
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s1.dequeue(4)
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s2.enqueue(7)
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s2.enqueue(13)
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s2.enqueue(16)
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if s1.var_pop() != s2.var_pop() {
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t.Errorf("got %v, want %v", s1, s2)
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}
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}
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func Test_covar(t *testing.T) {
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t.Parallel()
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var c1, c2 welford2
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c1.enqueue(3, 70)
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c1.enqueue(5, 80)
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c1.enqueue(2, 60)
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c1.enqueue(7, 90)
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c1.enqueue(4, 75)
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if got := c1.covar_samp(); got != 21.25 {
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t.Errorf("got %v, want 21.25", got)
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}
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if got := c1.covar_pop(); got != 17 {
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t.Errorf("got %v, want 17", got)
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}
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c1.dequeue(3, 70)
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c2.enqueue(5, 80)
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c2.enqueue(2, 60)
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c2.enqueue(7, 90)
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c2.enqueue(4, 75)
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if c1.covar_pop() != c2.covar_pop() {
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t.Errorf("got %v, want %v", c1.covar_pop(), c2.covar_pop())
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}
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}
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func Test_correlation(t *testing.T) {
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t.Parallel()
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var c welford2
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c.enqueue(1, 3)
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c.enqueue(2, 2)
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c.enqueue(3, 1)
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if got := c.correlation(); got != -1 {
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t.Errorf("got %v, want -1", got)
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}
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}
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