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st: basis for selection of observations for nonparametric correlation?
From
Edith Marshall <[email protected]>
To
[email protected]
Subject
st: basis for selection of observations for nonparametric correlation?
Date
Mon, 4 Jul 2011 00:19:27 -0700
Hello, all
Please forgive my ignorance and, thus, need to post - I am new to
STATA and rusty with my stats!
I am running Spearman's rank correlation (nonparametric) on a data set
of 167 observations. I have some missing values and legitimate zeros.
After selecting the variables of interest and specifying that I want
to see the the correlation coefficient, the number of observations,
and the significance value, I get my correlation results table. The
number of observations is 27 for all variable comparisons. When I
check the box that forces all observations to be considered and re-run
the analysis, I get between 24 and 167 observations used for the
different comparisons.
Can anyone tell me the basis for which observations are used (the
default) when I don't force all of them in? I need to decide which
correlation results to use and don't understand how STATA has selected
the 27 from the 167. Obviously, I would prefer to have more
observations but also want the results to be legitimate.
Thanks in advance for all of your valuable input!!
Best,
E Marshall
--
Edie Marshall
DVM, MPVM, DACVPM
--
Edie Marshall
DVM, MPVM, DACVPM
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