How to count number of Numeric values in a column

Question

I have a dataframe, and I want to produce a table of summary statistics including number of valid numeric values, mean and sd by group for each of three columns. I can\'t seem

Answer 1

What are "blank values" and "text values"? If you have numeric vector then you could have NA's (is.na()), Inf's (is.infinite()), NaN's (is.nan()) and "valid" numeric values.

For "valid" numeric values (in the sense above) you could use is.finite():

is.finite(c(1,NA,Inf,NaN))
# [1]  TRUE FALSE FALSE FALSE
sum( is.finite(c(1,NA,Inf,NaN)) )
# [1] 1

So colSums(is.numeric(x)) could be done like colSums(is.finite(x)).