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aaron
2007 Nov 25
2
rowMean, specify subset of columns within Dataframe?
I would like to calculate the mean of tree leader increment growth over 5
years (I1 through I5) where each tree is a row and each row has 5 columns.
So far I have achieved this using rowMeans when all columns are numeric type
and used in the calculation:
Data1 <- data.frame(cbind(I1 = 3, I2 = c(0,3:1, 2:5,NA), I3
=c(1:4,NA,5:2),I4=2,I5=3))
Data1
Data1$mean_5 <- rowMeans(Data1, na.rm =T)
2008 May 29
1
package for stochastic frontier models?
I need to estimate maximum tree crown radius and am looking for a package to
prepare stochastic frontier models in R. I have not found any package
references on Nabble R help, google, or R help. Any tips on a package for
this?
With regards,
Aaron Trowbridge
Researcher
BV Research Centre
Smithers B.C.
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2007 Nov 23
0
R users in Cyprus
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