[R] cor

[Peter B. Mandeville]

Greetings:

It would seem to me that the three arguments "a", "c" and "p" ought to 
produce the same result with a data frame that doesn't have any missing 
data which is not the case. What am I doing wrong or what don't I understand?

 > tmp <- data.frame(vol,con,mot,esp,pri,sec)
 > tmp
     vol con mot esp pri sec
1  1.00 120  90  78  21   1
2  0.50  60  25  80  15   5
3  0.50  50  40  52  46   2
4  1.00 257  60  78  20   2
5  0.50 150  85  85  11   4
6  0.50 113   5  79  18   3
7  0.50 117  60  67  30   3
8  1.00 193  60  74  23   3
9  0.50 139  60  50  46   4
10 0.50 144  70  67  31   2
11 1.00 127  80  47  41  12
12 0.50 200  80  42  40  18
13 0.75 106  40  58  33   9
14 0.50 127  30  61  28  11
15 0.50 200  50  51  45   4
16 1.00 229  80  70  27   3
17 0.75 207  50  62  28  10
18 0.25  63  30  60  35   5
19 1.00  58  80  67  29   4
 > cor(tmp)
             vol         con         mot         esp         pri         sec
vol  1.00000000  0.36263681  0.52616642  0.21163185 -0.21149234 -0.09813069
con  0.36263681  1.00000000  0.34665834  0.02016283 -0.07877831  0.12922310
mot  0.52616642  0.34665834  1.00000000 -0.04678632  0.04038370  0.03675419
esp  0.21163185  0.02016283 -0.04678632  1.00000000 -0.94112303 -0.60128659
pri -0.21149234 -0.07877831  0.04038370 -0.94112303  1.00000000  0.29576002
sec -0.09813069  0.12922310  0.03675419 -0.60128659  0.29576002  1.00000000
 > cor(tmp,use="a")
             vol         con         mot         esp         pri         sec
vol  1.00000000  0.36263681  0.52616642  0.21163185 -0.21149234 -0.09813069
con  0.36263681  1.00000000  0.34665834  0.02016283 -0.07877831  0.12922310
mot  0.52616642  0.34665834  1.00000000 -0.04678632  0.04038370  0.03675419
esp  0.21163185  0.02016283 -0.04678632  1.00000000 -0.94112303 -0.60128659
pri -0.21149234 -0.07877831  0.04038370 -0.94112303  1.00000000  0.29576002
sec -0.09813069  0.12922310  0.03675419 -0.60128659  0.29576002  1.00000000
 > cor(tmp,use="c")
             vol         con         mot         esp         pri         sec
vol  1.00000000  0.36263681  0.52616642  0.21163185 -0.21149234 -0.09813069
con  0.36263681  1.00000000  0.34665834  0.02016283 -0.07877831  0.12922310
mot  0.52616642  0.34665834  1.00000000 -0.04678632  0.04038370  0.03675419
esp  0.21163185  0.02016283 -0.04678632  1.00000000 -0.94112303 -0.60128659
pri -0.21149234 -0.07877831  0.04038370 -0.94112303  1.00000000  0.29576002
sec -0.09813069  0.12922310  0.03675419 -0.60128659  0.29576002  1.00000000
 > cor(tmp,use="p")
           vol         con        mot         esp         pri         sec
vol 1.0000000  0.35898321 0.33585184  0.26418611  0.31817707  0.34311708
con 0.3589832  0.99240991 0.34399506  0.02035910 -0.07698392  0.12891702
mot 0.3358518  0.34399506 0.98480785  0.04365569  0.08719418  0.05687228
esp 0.2641861  0.02035910 0.04365569  0.99985490 -0.85247286 -0.55912698
pri 0.3181771 -0.07698392 0.08719418 -0.85247286  0.98445398  0.30189124
sec 0.3431171  0.12891702 0.05687228 -0.55912698  0.30189124  0.95034447

Thank you very much,

Peter B.