Dear list members, I have a question regarding too subsetting a data set in R.
I created an object for my data: >pa = read.csv("espec_indic.csv", header = T, sep=",", check.names = F) > levels(pa$influencia) [1] "AID" "AII" "AP" The object has 3 levels for influencia (AP, AID, AII) Now I subset only observations with influencia = "AID" >pa2 = subset(pa, influencia=="AID") but if I ask for the levels of influencia still show me the 3 levels, AP, AID, AII. > levels(pa2$influencia) [1] "AID" "AII" "AP" Why is that? I was thinking that I was creating a new data frame with only AID as a level for influencia. How can I make a complete new object with only the observations for "AID" and that the only level for influencia is indeed "AID"? Best, Manuel -- *Manuel Spínola, Ph.D.* Instituto Internacional en Conservación y Manejo de Vida Silvestre Universidad Nacional Apartado 1350-3000 Heredia COSTA RICA mspin...@una.ac.cr mspinol...@gmail.com Teléfono: (506) 2277-3598 Fax: (506) 2237-7036 Personal website: Lobito de río <https://sites.google.com/site/lobitoderio/> Institutional website: ICOMVIS <http://www.icomvis.una.ac.cr/> [[alternative HTML version deleted]]
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