Hi all,

Assume that I have the following 10 data points.
 x=c(  46, 125 , 36 ,193, 209, 78, 66, 242 , 297 , 45)

sort x  and get the following
  y= (36 , 45 , 46,  66, 78,  125,193, 209, 242, 297)

I want to  group the sorted  data point (y)  into  equal number of
observation per group. In this case there will be three groups.  The first
two groups  will have three observation  and the third will have four
observations

group 1  = 34, 45, 46
group 2  = 66, 78, 125
group 3  = 193, 209, 242,297

Finally I want to calculate the group mean

group 1  =  42
group 2  =  87
group 3  =  234

Can anyone help me out?

In SAS I used to do it using proc rank.

thanks in advance

Val

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