Dear NLME Forum, I’m working with the bootstrap results of my analysis and I have a question concerning standard error vs standard deviation. The BootTheta output gives Parameter, Mean, Stderr, and etc. When the rawout.csv is examined in Excel, we can compute the STDEVP function on the thetas and it matches up with the Stderr results. My question is whether this is the way Phoenix is calculating this number or whether it is as a colleague of my suggests below. “The difference in standard deviations is that you have used the “STDEVPA” formula and I used “STDEV”. This means that you have divided the sum of the squares by 200 and I have divided then by 199. I am not a statistician and can’t say who is right. However, the answer in both cases is a standard deviation and not a standard error. What I think that Phoenix has generated is the mean of the 200 standard errors which, I think, happens to equal the standard deviation of the mean.” That is a bit over my pay grade as a famous US politician once said. I don’t believe that Phoenix even generates each individual replica’s standard error as I could not locate them on any output. Any help would be appreciated. Kind regards, Jim McDowell