well, one way is to say ... i have n=10 ... so, there are 2 zeros, 3 ones,
etc. and find it based on that data ... doesn't matter if there are 10 or
100 or 1000 ... now, if you had some n that did not divide exactly by these
p values ... there might be another algebraic way to do it
as long as the X values are fixed ... and the p values ... then you could
do it that way ... of course, without the X values .. you are lost
At 09:35 AM 1/6/01 -0500, Chris Chiu wrote:
>Dear friends:
>
>Does anyone know / remember how to obtain the standard deviation of a set
>of numbers given only a frequency table?
>
>e.g.,
>x f(x)
>0 0.2
>1 0.3
>2 0.2
>3 0.2
>4 0.1
>
>Many thanks.
>Chris
>
>
>
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dennis roberts, penn state university
educational psychology, 8148632401
http://roberts.ed.psu.edu/users/droberts/drober~1.htm
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