[R] Crosstab with Average and Count

[arun]

Hi,

Try this:
dat1<-data.frame(x,y,z)


 xtabs(z~x+y,aggregate(z~x+y,dat1,mean))
   y
x    10  20  30
  1 100   0   0
  2   0 200   0
  3   0   0 300

table(dat1$z,dat1$y)
     
      10 20 30
  100  2  0  0
  200  0  3  0
  300  0  0  3
or,
table(dat1$x,dat1$z)
   
    100 200 300
  1   2   0   0
  2   0   3   0
  3   0   0   3




A.K.



----- Original Message -----
From: vioravis <vioravis at gmail.com>
To: r-help at r-project.org
Cc: 
Sent: Friday, July 20, 2012 6:30 AM
Subject: [R] Crosstab with Average and Count

I have the following data:

x <- as.factor(c(1,1,1,2,2,2,3,3,3))
y <- as.factor(c(10,10,10,20,20,20,30,30,30))
z <- c(100,100,NA,200,200,200,300,300,300)

I could create the cross tab of x and y with Sum of z as its elements using
the xtabs function as follows:

# X Vs. Y with Sum Z

xtabs(z ~ x + y)

   y
x    10  20  30
  1 200   0   0
  2   0 600   0
  3   0   0 900

How do I replace the sum with average and count so that I can get the
following outputs??

# X Vs. Y with Average of Z
   y
x      10  20  30
  1    100 0   0
  2    0   200 0
  3    0   0   300

# X Vs. Y with Count Z
  y
x    10  20  30
1    2   0   0
2    0   3   0
3    0   0   3

Would appreciate any help on these? Thank you.

Ravi





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