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Re: Selecting sample within one standard deviation in R [message #24066 is a reply to message #24064]

Tue, 15 February 2022 16:52

Bridgette-DHS
Messages: 3036
Registered: February 2013

Senior Member

Following is a response from DHS Research & Data Analysis Director, Tom Pullum:

You have an extremely skewed distribution. The "68%" rule works for normally distributed variables, and the normal approximation doesn't work for your variable. I can think of two options. One would be to take the log of the frequency, which will have a distribution that is more nearly normal, but there's the problem that you can't take the log of 0. Another option would be to calculate the percentiles of the distribution. If you identify the 25th and 75th percentiles, then you have the boundaries for the middle 50%. Or identify the 16th and 84th percentiles, which enclose the middle 68%.

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[Message index]

		Selecting sample within one standard deviation in R By: berhardt93 on Tue, 15 February 2022 15:00
		Re: Selecting sample within one standard deviation in R By: Bridgette-DHS on Tue, 15 February 2022 16:52

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