flexplots sterr errorbars

[amanasj]

Hello Dustin. First thank you for the wonderful packages, they've been really helpful.

I noted whist using the sterr option on flexplot that the errorbars were inconsistent with ones I produced manually when plotting in ggplot. Looking through the flexplot helper functions (where sterr is calculated) you have:

else if (spread=="sterr"){
summary1 = "stat_summary(fun.y='mean', geom='point', size=3, position=position_dodge(width=.5), color = '#bf0303')"
summary2 = "stat_summary(geom='errorbar', fun.ymin = function(z){mean(z)-1.96*(sd(z)/sqrt(length(z)-1))}, fun.ymax = function(z){mean(z)+1.96*(sd(z)/sqrt(length(z)-1))}, width=.2, linewidth = 1.25, position=position_dodge(width=.2), color = '#bf0303')"

Is this the correct calculation for SEM? Should it not be SEM=SD/sqrt(n)? You have a 1.96 multiplier which I think is for 95% CI's and you also have an n-1 term which is for sample SD calc. Any clarification would be greatly appreciated.

Thanks
Aman