Hi all,

I have a data frame with some measured values of some animals. Sometimes the
measurement failed, resulting in a NA for a measurement and sometimes the
animal died, resulting in NA for all measurements.

I have several groups of animals. How do I find the size of each group with
only alive animals? And how do I find the size of the groups for each
measurement?

An example:
l1 <- list(factor=c(24,24,24), val1=c(2, 3, NA), val2=c(4, NA, NA))
df <- as.data.frame(l1)
df$factor <- factor(df$factor)

The size of factors should be 2 and not 3.  The number of measurement in
val1 should be 2 and the number of measurements in val2 should be 1

Thanks in advance for any help and suggestions
Ulrik

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