[R] Correlation dichotomous factor, continous (numerical) and ordered factor
birgit.lemcke at systbot.uzh.ch
Wed Aug 6 16:16:22 CEST 2008
I appologise in advance if this should also go into statistics but I am
I have a data.frame (about 300 rows and about 80 variables) and my variables
are dichotomous factors, continuous (numerical) and ordered factors.
I would like to calculate the linear correlation between every pair of my
variables, because I would like to perform a logistic regression (glm())
without the correlation between variables.
I thought I could use for the continous (numerical) and ordered factor a
spearman correlation that is using the ranks.
But I thought also that I have to use a contingency table for the
I read also that it is possible to use a point-biserial correlation to
calculate the correlation between dichotomous and continuous variables.
Now I am confused what I should use to calculate the correlation using all
my variables and how I could do that in R.
Is it possible with cor(), rcorr(), cormat() or other R-functions using one
of the available correlation-coefficients.
I would be very happy if somebody could enlighten my darkness.
Many thanks in advance.
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