how to find standard deviation in six sigma format?
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I have plot my data with the help of scater plot. But in data statistics it is only mean and standard deviation. I need my plot which shows 1sigma, 2 sigma , 3sigma how to do that?
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Answers (1)
Cris LaPierre
on 29 Aug 2023
Edited: Cris LaPierre
on 29 Aug 2023
The function std returns one standard deviation. Multiply by +/-1, +/-2 and +/-3 to get more than that.
Here's a simple example
% generate a distribution
x = linspace(425,745,200);
y = normpdf(x,580,35);
scatter(x,y)
mu = mean(x)
xline(mu,'g--')
sd = std(x)
xline(mu + sd,'m--')
xline(mu - sd,'m--')
xline(mu + 2*sd,'b:')
xline(mu - 2*sd,'b:')
xline(mu + 3*sd,'k-.')
xline(mu - 3*sd,'k-.')
2 Comments
Cris LaPierre
on 30 Aug 2023
I can't duplicate the error. Please attach your spreadsheet to your post using the paperclip icon
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