Standard deviations

[Patricia Warren]

Hi everyone,

Can someone provide for me the equation that STATA uses to calculate standard deviations for binary variables?

Thank you for assistance!

Patricia

[Nick Cox]

https://www.stata.com/manuals/rsummarize.pdf p.9

[Patricia Warren]

Thanks Nick. I know the code to get the standard deviation. I am asking for the equation that the software uses to calculate it.

[Carlo Lazzaro]

Patricia:
does the Methods section of -summarize- help?

[Nick Cox]

The source in #2 gives the equation. The detail you probably seek is that n - 1 appears in the denominator, not n.