Danilo Maurizio
2001-Dec-11 11:54 UTC
[R] how can i have the total for each level using table,ftable,xtabs etc. etc. ?
I have a list with four fields and 3500 records, from a MySQL table. How can i have the total for each level using table, ftable, xtabs? ex: print(ftable(table[,"field1"]~table[,"field2"])) thanks Danilo Maurizio Veneto Lavoro - Area Osservatorio - -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
Kaspar Pflugshaupt
2001-Dec-11 12:25 UTC
[R] how can i have the total for each level using table,ftable,xtabs etc. etc. ?
On 11.12.2001 12:54 Uhr, Danilo Maurizio wrote:> I have a list with four fields and 3500 records, from a MySQL table. > How can i have the total for each level using table, ftable, xtabs?I'm not sure I've understood how your data is organized. If you have it within a dataframe (which I recommend), you could use tapply(): tapply(mydata$datafield, list(mydata$field1, mydata$field2), sum) The first argument is the column containing the data to be summed up. The second argument lists all the factors (1..n) for whose levels you want the sum calculated. You will get a sum for each combination of levels. For details, see help(tapply). A similar function is by(), but I haven't used it yet. I think it gives nicer output. Cheers Kaspar Pflugshaupt -- Kaspar Pflugshaupt Geobotanisches Institut Zuerichbergstr. 38 CH-8044 Zuerich Tel. ++41 1 632 43 19 Fax ++41 1 632 12 15 mailto:pflugshaupt at geobot.umnw.ethz.ch privat:pflugshaupt at mails.ch http://www.geobot.umnw.ethz.ch -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._