Hi,
?na.omit()
dat1<-read.table(text="
Tool Step_Number
A 1
A 2
A 3
A 3
B 1
B 2
B 2
B 3
B NA
NA 3
",sep="",header=TRUE,stringsAsFactors=FALSE)
dcast(na.omit(dat1),Tool~Step_Number,length)
#Using Step_Number as value column: use value.var to override.
# Tool 1 2 3
#1 A 1 1 2
#2 B 1 2 1
A.K.
----- Original Message -----
From: "michael.laviole...@dhhs.state.nh.us"
<michael.laviole...@dhhs.state.nh.us>
To: r-help@r-project.org
Cc:
Sent: Monday, December 3, 2012 10:07 AM
Subject: [R] Excluding all missing values with dcast ("reshape2" package)
Hello--I'm doing a simple crosstab using dcast:
rawfreq <- dcast(nh11brfs, race3~CHCCOPD, length)
with the results
race3 Yes No NA
1 White non-Hispanic 446 5473 21
2 Other non-Hispanic 29 211 0
3 Hispanic 6 81 1
4 <NA> 10 83 1
How would I modify this call to exclude all missing values; that is, to
obtain
race3 Yes No
1 White non-Hispanic 446 5473
2 Other non-Hispanic 29 211
3 Hispanic 6 81
Apologies if this has come up before, and thanks.
-M.L.
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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
