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st: exploratory factor analysis with dichotomous and continuous data
From
Frauke Rudolf <[email protected]>
To
"[email protected]" <[email protected]>
Subject
st: exploratory factor analysis with dichotomous and continuous data
Date
Wed, 21 Nov 2012 10:37:37 +0000
Hi,
I am trying to run an exploratory factor analysis with both dichotomous and continuous data using the polychoric command.
However, when I try to run it, I get the following error message:
"numerical derivatives are approximate
nearby values are missing
could not calculate numerical derivatives
missing values encountered
numerical derivatives are approximate
nearby values are missing
could not calculate numerical derivatives
missing values encountered"
I found some useful threads on the net, so now I know why I get the message; It is due to one of the dichotomous variables having 0 observations in one of the 2x2 tables:
haemoptysi | cough
s | 1 2 | Total
-----------+----------------------+----------
1 | 168 0 | 168
2 | 896 53 | 949
-----------+----------------------+----------
Total | 1,064 53 | 1,117
What I could not find, was a solution on, how to deal with this in order to be able to run an EFA.
I hope you can help me with this.
Frauke
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