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jcurry
jcurry
Level I

How can JMP calculate a weighted median?

Aug 21, 2012 03:55 PM (9177 views)

I have a survey data set with 35000 observations that includes a population weight to estimate the total U.S.  I'm not a SAS expert and I need to calculate weighted median as well as weighted quantiles. I have the weight data tagged with the weight role, but that seems to only apply to weighted averages.  Any suggestions?  Thanks.

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ms
Super User (Alumni) ms
Super User (Alumni)
Solution

Re: How can JMP calculate a weighted median?

Aug 22, 2012 04:19 AM (11231 views)  |  Posted in reply to message from jcurry 08-21-2012

Try the frequency role in the distribution platform. At least with integer weights JMP gives quantiles that appears to be adequately weighted, at least they seem to be intuitively right. Fraction weights works too, but I don't know how JMP uses them in the quantile calculations.

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ms
Super User (Alumni) ms
Super User (Alumni)
Solution

Re: How can JMP calculate a weighted median?

Aug 22, 2012 04:19 AM (11232 views)  |  Posted in reply to message from jcurry 08-21-2012

Try the frequency role in the distribution platform. At least with integer weights JMP gives quantiles that appears to be adequately weighted, at least they seem to be intuitively right. Fraction weights works too, but I don't know how JMP uses them in the quantile calculations.

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jcurry
jcurry
Level I

Re: How can JMP calculate a weighted median?

Aug 22, 2012 12:02 PM (8689 views)  |  Posted in reply to message from ms 08-22-2012

Thanks MS...this did exactly what I needed.

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