Dear R-helpers, Happy New Year to all the helpful members of the list.
Here is the behavior I'm looking for: > v1 <- c("a","b","c") > n1 <- c(0, 1, 2) > v2 <- c("c", "a", "b") > n2 <- c(0, 1 , 2) > (f1 <- data.frame(v1, n1)) v1 n1 1 a 0 2 b 1 3 c 2 > (f2 <- data.frame(v2, n2)) v2 n2 1 c 0 2 a 1 3 b 2 > (m12 <- merge(f1, f2, by.x = "v1", by.y = "v2", sort = F)) v1 n1 n2 1 c 2 0 2 a 0 1 3 b 1 2 Now to my data: > summary(pL) pairL a fondo : 41 alto : 41 ampio : 41 angoloso : 41 aperto : 41 appoggiato: 41 (Other) :1271 > pL$pairL[c(1,42)] [1] appoggiato dentro 37 Levels: a fondo alto ampio angoloso aperto appoggiato asimmetrico complicato convesso davanti dentro destra ... verticale > summary(oppN) pairL pairR subject L LL RR M a fondo : 41 a galla : 41 S1 : 37 Min. :0.3646 Min. :0.02083 Min. :0.0010 Min. :0.0000 alto : 41 acuto : 41 S10 : 37 1st Qu.:0.5521 1st Qu.:0.37500 1st Qu.:0.1771 1st Qu.:0.1042 ampio : 41 arrotondato: 41 S11 : 37 Median :0.6354 Median :0.47917 Median :0.2708 Median :0.2292 angoloso : 41 basso : 41 S12 : 37 Mean :0.6403 Mean :0.46452 Mean :0.2760 Mean :0.2598 aperto : 41 chiuso : 41 S13 : 37 3rd Qu.:0.7188 3rd Qu.:0.55208 3rd Qu.:0.3750 3rd Qu.:0.3854 appoggiato: 41 compl : 41 S14 : 37 Max. :0.9375 Max. :0.92708 Max. :0.6042 Max. :0.7812 (Other) :1271 (Other) :1271 (Other): 1295 NA's :3.0000 NA's : 3.0000 asym polar polar_a1 clust Min. :-0.5555 Min. :-1.2410 Min. :-2.949e+00 c1:492 1st Qu.: 0.2091 1st Qu.: 0.4571 1st Qu.:-1.902e-01 c2:287 Median : 0.5555 Median : 1.1832 Median :-1.110e-16 c3: 82 Mean : 0.6265 Mean : 1.3428 Mean :-5.745e-02 c4:246 3rd Qu.: 0.9383 3rd Qu.: 2.0712 3rd Qu.: 1.168e-01 c5: 82 Max. : 2.7081 Max. : 4.6151 Max. : 4.218e+00 c6:328 NA's : 3.0000 NA's : 3.000e+00 > oppN$pairL[c(1,42)] [1] spesso fine 37 Levels: a fondo alto ampio angoloso aperto appoggiato asimmetrico complicato convesso davanti dentro destra ... verticale > unique(sort(oppM$pairL)) == unique(sort(pL$pairL)) [1] TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE [26] TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE In other words I think that pL$pairL and oppN$pairL consists of 37 blocks of 41 repetitions of names, and that these blocks are permutations of each other, However: > summary(m1 <- merge(oppM, pairL, by.x = "pairL", by.y = "pairL", sort = F)) pairL pairR subject L LL RR M a fondo : 1681 a galla : 1681 S1 : 1517 Min. : 0.3646 Min. :0.02083 Min. :0.0010 Min. :0.0000 alto : 1681 acuto : 1681 S10 : 1517 1st Qu.: 0.5521 1st Qu.:0.37500 1st Qu.:0.1771 1st Qu.:0.1042 ampio : 1681 arrotondato: 1681 S11 : 1517 Median : 0.6354 Median :0.47917 Median :0.2708 Median :0.2292 angoloso : 1681 basso : 1681 S12 : 1517 Mean : 0.6398 Mean :0.46402 Mean :0.2760 Mean :0.2598 aperto : 1681 chiuso : 1681 S13 : 1517 3rd Qu.: 0.7188 3rd Qu.:0.55208 3rd Qu.:0.3750 3rd Qu.:0.3854 appoggiato: 1681 compl : 1681 S14 : 1517 Max. : 0.9375 Max. :0.92708 Max. :0.6042 Max. :0.7812 (Other) :51988 (Other) :51988 (Other):52972 asym polar polar_a1 clust Min. :-0.5555 Min. :-1.2410 Min. :-2.949e+00 c1:20172 1st Qu.: 0.2091 1st Qu.: 0.4571 1st Qu.:-1.904e-01 c2:11644 Median : 0.5555 Median : 1.1832 Median :-1.110e-16 c3: 3362 Mean : 0.6234 Mean : 1.3428 Mean :-5.745e-02 c4:10086 3rd Qu.: 0.9383 3rd Qu.: 2.0712 3rd Qu.: 1.169e-01 c5: 3362 Max. : 2.7081 Max. : 4.6151 Max. : 4.218e+00 c6:13448 I was expecting pairL to be 41 items longs, not 1681 = 41^2. _____________________________ Professor Michael Kubovy University of Virginia Department of Psychology USPS: P.O.Box 400400 Charlottesville, VA 22904-4400 Parcels: Room 102 Gilmer Hall McCormick Road Charlottesville, VA 22903 Office: B011 +1-434-982-4729 Lab: B019 +1-434-982-4751 Fax: +1-434-982-4766 WWW: http://www.people.virginia.edu/~mk9y/ ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html