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...attendend one time a year. In this case 2 persons, because i=2 has no observation in 2007. I thought about creating a subset with the duplicate function. But I can't find a way to control (i) and (y). subset(data, !duplicated(i[y])) Thanx so much Andreas Kunzler ____________________________ Bundeszahn?rztekammer (BZ?K) Chausseestra?e 13 10115 Berlin Tel.: 030 40005-113 Fax: 030 40005-119 E-Mail: a.kunzler at bzaek.de

...generate the following selection automatically (maybe for loop), so that it makes no difference if there are two or ten columns involved. Selection: d[d$Var.1==9 | d$Var.1==9 | d$Var.1==9 ,] Does anybody know a way? Thanks Mit freundlichen Gr??en Andreas Kunzler ____________________________ Bundeszahn?rztekammer (BZ?K) Chausseestra?e 13 10115 Berlin Tel.: 030 40005-113 Fax: 030 40005-119 E-Mail: a.kunzler at bzaek.de

...sed to separated ids. Assume a data (d) structure like Var NA NA NA NA NA 1 1|2 1|22|45 3 4b|24789 I need to know the maximum number of ids within one object. In this case 3 (1|22|45) Does anybody know a better way? Thanks Mit freundlichen Gr??en Andreas Kunzler ____________________________ Bundeszahn?rztekammer (BZ?K) Chausseestra?e 13 10115 Berlin Tel.: 030 40005-113 Fax: 030 40005-119 E-Mail: a.kunzler at bzaek.de

...l) 1,2,3,4,5,3,0 (Counts of a where b==A) 2,4,4,4,3,5,1 (Counts of a where b==B) I tried to change the class of the table result to a matrix but I could not find a way to use the results of tapply. I use tapply because b has 15 different values. Thanx Andreas Kunzler ____________________________ Bundeszahn?rztekammer (BZ?K) Chausseestra?e 13 10115 Berlin Tel.: 030 40005-113 Fax: 030 40005-119 E-Mail: a.kunzler at bzaek.de