[R] Subset results of tapply

From: Dong-hyun Oh <r.arecibo_at_gmail.com>
Date: Thu, 7 Feb 2008 13:13:33 +0100


Dear UseRs,

I would like to extract only p.value by performing wilcox.test with tapply function.

Example data.frame is as follows:
> tmp

     name year      Dtt    Dt2t2      Dgt     Dgt2        ec         
tc        pc

1 AUS 1991 1.162935 1.141352 1.168011 1.193882 1.0189098 0.9601735 0.9783301
2 AUS 1992 1.141352 1.000000 1.193882 1.181406 1.1413519 0.8854061 1.0105599
3 AUS 1993 1.000000 1.000000 1.181406 1.198598 1.0000000 0.9856568 0.9856568
4 AUS 1994 1.000000 1.000000 1.198598 1.187553 1.0000000 1.0093005 1.0093005
5 AUS 1995 1.000000 1.000000 1.187553 1.207423 1.0000000 0.9835433 0.9835433
.........................

15 AUT 1991 1.000000 1.000000 1.000000 1.023534 1.0000000 0.9770075 0.9770075
16 AUT 1992 1.000000 1.000000 1.023534 1.000000 1.0000000 1.0235336 1.0235336
17 AUT 1993 1.000000 1.000000 1.000000 1.012671 1.0000000 0.9874880 0.9874880
18 AUT 1994 1.000000 1.000000 1.012671 1.010350 1.0000000 1.0022970 1.0022970
19 AUT 1995 1.000000 1.000000 1.010350 1.029325 1.0000000 0.9815653 0.9815653
20 AUT 1996 1.000000 1.000000 1.029325 1.053247 1.0000000 0.9772873
0.9772873
.......................
.......................

I execute the following command
> tapply(tmp$pc, tmp$name, wilcox.test)

How can I extract only p.values of above command?

Best,



Center of Excellence for Science and Innovation Studies, Royal Institute of Technology, Sweden
e-mail: donghoh_at_infra.kth.se, doriaba2_at_snu.ac.kr, oh.dongh_at_gmail.com cell phone: +46 73 563 45 22

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