[R] average of y at each level of x?

I have x,y data and would like to compute the average of y at each level of x. x [1] 0.006110 0.007027 0.007027 0.007027 0.008081 0.008081 0.008081 0.008081 [9] 0.008081 0.008081 0.008081 0.009293 0.009293 0.009293 0.009293 0.009293 [17] 0.009293 0.009293 0.009293 0.010686 0.010686 0.010686

RE: [R] average of y at each level of x?

Try (untested): p1 - tapply(y, x, function(z) mean(z == 0)) HTH, Andy From: Bill Simpson [mailto:[EMAIL PROTECTED] I have x,y data and would like to compute the average of y at each level of x. x [1] 0.006110 0.007027 0.007027 0.007027 0.008081 0.008081 0.008081 0.008081 [9]

Re: [R] average of y at each level of x?

one way that works is: sapply(split(y,x), mean) Bill __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help

Re: [R] average of y at each level of x?

On 7 Nov 2003 at 9:47, Bill Simpson wrote: Since your y is 0-1 the following works: tapply(x, y ,mean) aggregate(x, y, mean) gives the output in a different format. Kjetil Halvorsen I have x,y data and would like to compute the average of y at each level of x. x [1] 0.006110 0.007027