1 Reply Latest reply on Nov 15, 2018 9:45 AM by Jim Dehner

    Cumulative St Dev as sample size grows???

    Drew Hull

      Hi All - I am trying to calculate and plot the St Dev on a metric as the sample size grows.  The attached Excel sheet shows a sample data set with 20 tests and the associated speed result.  After 2 tests, I can calculate the St Dev of those 2, add the 3rd test and St Dev changes, all the way to the last test.

      I cannot for the life of me figure out how to do this in Tableau!  Please help!