added comment for more direct wikipedia citation

2022-06-27 14:37:12 -04:00 · 2022-06-27 14:37:12 -04:00 · 54cd636524
commit 54cd636524
parent 14189fd848
1 changed files with 1 additions and 0 deletions
--- a/packages/squiggle-lang/src/rescript/Distributions/SymbolicDist/SymbolicDist.res
+++ b/packages/squiggle-lang/src/rescript/Distributions/SymbolicDist/SymbolicDist.res
@ -133,6 +133,7 @@ module Beta = {
  }

  let fromMeanAndStdev = (mean, stdev) => {
+    // https://en.wikipedia.org/wiki/Beta_distribution#Mean_and_variance
    let var = stdev *. stdev
    let sampleSize = mean *. (1.0 -. mean) /. var
    mean->fromMeanAndSampleSize(sampleSize)