FAQ/poolse - CBU statistics Wiki

Upload page content

You can upload content for the page named below. If you change the page name, you can also upload content for another page. If the page name is empty, we derive the page name from the file name.

File to load page content from
Page name
Type the odd letters out: ONlY twO thinGs aRE infiNite

location: FAQ / poolse

How do I obtain a pooled mean standard error?

Suppose we wish to pool over each of K people (or groups) with the k-th individual having variance V(k) and mean m(k) based on a sample of size n(k).

Then pooling the K variances we have

Pooled Variance V = [sum k to K (n(k)-1) V(k)] / [sum_k to K (n(k) -1)]

and we can use this pooled variance to obtain the standard error of the mean since

Pooled Mean Standard Error = Sqrt{ [V] / [sum_k to K n(k) ] }