placing mean,total and max together in a table in r

Question

I have some simple commands looking into totals, means and maximums of a variable whilst another variable is an assigned value:

sum(data[data$var1==1,]$var2)
mea         


        

Answer 1

Look at the tables package, read through the vignette for the package shows how to do exactly what you are asking for.

> tabular( ( factor(cyl) + 1) ~ mpg * (sum + mean + max), data=mtcars )

             mpg             
 factor(cyl) sum   mean  max 
 4           293.3 26.66 33.9
 6           138.2 19.74 21.4
 8           211.4 15.10 19.2
 All         642.9 20.09 33.9