SEM vs. SD

[nastarandarjani]

I wonder why standard deviation in line 698 of examples/understanding_statistics.m didn't divide to the square root of population. I think, it is supposed to be standard error of means, due to the mean estimation of within groups.

[treder]

Is this a general question about the computation of perf_std? The line you mention isn't specifically about SEM/SD.
More generally, when showing errobars either SEM or SD are valid depending on what you want to show. I like SD because it's constant irrespective of N whereas SEM scales down with sqrt(N), so you can make it arbitrarily small by increasing N. Nothing wrong with computing SEM though and showing that, I usually prefer SEM for visualisation in papers but I've seen both in the literature.

[nastarandarjani]

Isee, thank you.

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On Sat, May 21, 2022, 9:55 PM Matthias Treder ***@***.***> wrote: Is this a general question about the computation of perf_std? The line you mention isn't specifically about SEM/SD. More generally, when showing errobars either SEM or SD are valid depending on what you want to show. I like SD because it doesn't scale with N, it's constant irrespective of N whereas SEM scales down with sqrt(N), so you can make it arbitrarily small by increasing N. Nothing wrong with computing SEM though and showing that. — Reply to this email directly, view it on GitHub <#33 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AQHHE7437A6BZMJJ72NIPI3VLEMCHANCNFSM5WSBZOMA> . You are receiving this because you authored the thread.Message ID: ***@***.***>