Hi,
I am not perfectly sure what you want to do, but here is what I would do
to maintain good/bad ratio in the sample (as Daniel posted, split the
data and sample from the groups):
df <- data.frame(V1 = 1:400, V2 = c(rep("good",360), rep("bad",40)))
isGood <- which(df$V2=="good")
isBad <- which(df$V2=="bad")
sampleGood <- df[sample(isGood, replace=TRUE),]
sampleBad <- df[sample(isBad, replace=TRUE),]
summary(rbind(sampleGood, sampleBad))
Please include a more specific example with test data (for "final" in
this case) next time.
Best regards,
Andreas
taby gathoni schrieb:
Dear all,
i have a dataset of about 400 records , with a variable that has two levels 40
bad and 360 good among other variables,how do i come up with10 random samples
that have the composition of as the main sample but maintaining the 40 bad 360
good with replacement, i recently discovered that my random samples generated
dont maintain the ratio. My code is as :
mysample <- final[sample(1:nrow(final), 400,replace=TRUE),]
does not give me the ratio of 40 bad and 360 good can anyone give me some
pointers please?
Thanks,
Taby
[[alternative HTML version deleted]]
------------------------------------------------------------------------
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
--
Andreas Borg
Medizinische Informatik
UNIVERSITÄTSMEDIZIN
der Johannes Gutenberg-Universität
Institut für Medizinische Biometrie, Epidemiologie und Informatik
Obere Zahlbacher Straße 69, 55131 Mainz
www.imbei.uni-mainz.de
Telefon +49 (0) 6131 175062
E-Mail: b...@imbei.uni-mainz.de
Diese E-Mail enthält vertrauliche und/oder rechtlich geschützte Informationen.
Wenn Sie nicht der
richtige Adressat sind oder diese E-Mail irrtümlich erhalten haben, informieren
Sie bitte sofort den
Absender und löschen Sie diese Mail. Das unerlaubte Kopieren sowie die
unbefugte Weitergabe
dieser Mail und der darin enthaltenen Informationen ist nicht gestattet.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
