[R] rowVars

Uwe Ligges ligges at statistik.uni-dortmund.de
Sat Apr 1 16:14:17 CEST 2006

r user wrote:

> I am using the R 2.2.1 in a Windows XP environment.
> I have a dataframe with 12 columns and 1,000 rows.
> (Some of the rows have 1 or fewer values.)

fewer than 1? So you mean 0?
Well, the commonly used estimator for the variance is defined for n>=2 
elements only!

> I am trying to use rowVars to calculate the variance
> of each row.

I don't know a function rowVars in R-2.2.1 - and cannot find it ...

> I am getting the following message:
> “Error in na.remove.default(x) : length of 'dimnames'
> [1] not equal to array extent”

Hard to tell without knowing what you actually did.

Uwe Ligges

> Is there a good work-around?
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