Re: [R] difference in pairs ?

2011-02-22 Thread Vlatka Matkovic Puljic
Well, it should be difference by ID and TIME for q1: something like: for ID 1187 in TIME 1 q1=3 and TIME 2 (for same ID) q1=3 so diff would be 3-3=0 TIME ID q1 1 1187 3 1 1187 3 And I don't know how to make R to find pairs and calculate diff? 2011/2/21 Dennis

Re: [R] difference in pairs ?

2011-02-22 Thread Peter Ehlers
On 2011-02-22 12:51, Vlatka Matkovic Puljic wrote: Well, it should be difference by ID and TIME for q1: something like: for ID 1187 in TIME 1 q1=3 and TIME 2 (for same ID) q1=3 so diff would be 3-3=0 TIME ID q1 1 1187 3 1 1187 3 And I don't know how to make

[R] difference in pairs ?

2011-02-21 Thread Vlatka Matkovic Puljic
Dear all, I want to perform paired Wilcoxon signed ranks test on my data. I have pairs defined by ID and TIME variables. How can I calculate difference in variables q1, q2 in each pair? TIME ID q1 q2 1 1187 3 2 1 1706 3 3 1 1741 2 4 2 1187 3 2 2 1706 3 3 2 1741 2 4 Please, any clue! :) --

Re: [R] difference in pairs ?

2011-02-21 Thread Dennis Murphy
Hi: Assuming dd is the name of your data frame, dd$diff - with(dd, q2 - q1) dd TIME ID q1 q2 diff 11 1187 3 2 -1 21 1706 3 30 31 1741 2 42 42 1187 3 2 -1 52 1706 3 30 62 1741 2 42 is one way to do it. HTH, Dennis On Mon, Feb 21,