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c_weight
2011 Jun 24
0
lag and diff with transformBy
...st regards,
Michael
options(width=140)
library(doBy)
data(dietox)
dietox.ordered <- orderBy(~Evit+Cu+Litter+Time, data=dietox)
dietox.difference <- transformBy(~Evit+Cu+Litter, data=dietox.ordered,
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?lWeight=c(NA,lag(Weight,1)),
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?l4Weight=c(NA,NA,NA,NA,lag(Weight,4)),
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?dWeight=c(NA,diff(Weight,1)),
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?d2Weight=c(NA,NA,diff(Weight,2)),
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?dFeed=c(NA,diff(Feed,1))
? ? ? ? ? ? ? ? ? ?)
head(dietox.difference,24)
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