Hello,
There are two ways,
1.
?sum # see argument na.rm
sum(whatever, na.rm = TRUE)
2.
?table # produces the 2x2 contingency table, if there are only 2 values
Also, you should provide us with a data example, especially since your
code clearly doesn't work.
Use ?dput like this
dput( head(MyData, 20) ) # Then paste the output of this in a post.
Hope this helps,
Rui Barradas
Em 05-10-2012 14:26, Rerda escreveu:
Dear everyone
I am a bit of a computer imbecile and are having problems with R.
I am using R in my research project to do chi-square tests on data imported
from excel .
However I have som missing data in one of my variables (columns) and I need
R to "exclude" these and make chi-square test on the data that I have.
I use a formula to make 2x2 tables which is:
data <- matrix(c(sum(!Variable[Group....==1]), sum(Variable[DAAC....==1]),
sum(!Variable[Group....==0]), sum(Variable[DAAC....==0])),2,2)
How can I get R to ignore Na's in this formula?
Many Regards
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