Hi , how is it possible t cut some levels from one factor to subsetting a data.frame on? subdata <- subset(data, data$FACTOR="1" | data$FACTOR="BETA" | data$FACTOR="XY") ??? Maybe a modifcation here is better, but how? mergex[mergex$PLZX %in% levels(mergex$PLZX) ,] Many thanks and regards, Christian
Filter out some levels?
3 messages · Christian Schulz, Chuck Cleland, Douglas Bates
Christian Schulz wrote:
how is it possible t cut some levels from one factor to subsetting a data.frame on? subdata <- subset(data, data$FACTOR="1" | data$FACTOR="BETA" | data$FACTOR="XY") ??? Maybe a modifcation here is better, but how? mergex[mergex$PLZX %in% levels(mergex$PLZX) ,]
Christian:
You need element by element comparison. Does this help?
mydata <- data.frame(FACTOR = c("1", "BETA", "XY", "DROP"), Y =
runif(4))
mydata[mydata$FACTOR=="1" | mydata$FACTOR=="XY" |
mydata$FACTOR=="BETA",]
FACTOR Y
1 1 0.5111390
2 BETA 0.7219460
3 XY 0.1346707
mydata[mydata$FACTOR!="DROP",]
FACTOR Y
1 1 0.5111390
2 BETA 0.7219460
3 XY 0.1346707
See ?"=="
Chuck Cleland, Ph.D. NDRI, Inc. 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 452-1424 (M, W, F) fax: (917) 438-0894
Christian Schulz <ozric at web.de> writes:
how is it possible to cut some levels from one factor to subsetting a data.frame on? subdata <- subset(data, data$FACTOR="1" | data$FACTOR="BETA" | data$FACTOR="XY") ??? Maybe a modifcation here is better, but how? mergex[mergex$PLZX %in% levels(mergex$PLZX) ,]
Use %in%
subdata <- subset(data, FACTOR %in% c("1", "BETA", "XY"))