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Merge pull request #3031 from jspsych/fix-datacolumn-mean-2905

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Change `DataColumn.mean()` to ignore `null` and `undefined` values
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Josh de Leeuw 2024-06-14 17:50:03 -04:00 committed by GitHub
commit c3eb8e54c0
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2 changed files with 17 additions and 1 deletions
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5
.changeset/forty-weeks-walk.md Normal file
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@ -0,0 +1,5 @@
---
"jspsych": major
---
Changed the behavior of `DataColumn.mean()` to exclude `null` and `undefined` values from the calculation, as suggested in #2905

13
packages/jspsych/src/modules/data/DataColumn.ts
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@ -10,7 +10,18 @@ export class DataColumn {
}
mean() {
return this.sum() / this.count();
let sum = 0;
let count = 0;
for (const value of this.values) {
if (typeof value !== "undefined" && value !== null) {
sum += value;
count++;
}
}
if (count === 0) {
return undefined;
}
return sum / count;
}
median() {