R Dataset / Package geepack / spruce
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dataset-42604.csv | 26.58 KB |
Documentation |
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On this Picostat.com statistics page, you will find information about the spruce data set which pertains to Log-size of 79 Sitka spruce trees. The spruce data set is found in the geepack R package. Try to load the spruce data set in R by issuing the following command at the console data("spruce"). This may load the data into a variable called spruce. If R says the spruce data set is not found, you can try installing the package by issuing this command install.packages("geepack") and then attempt to reload the data with library("geepack") followed by data("spruce"). Perhaps strangley, if R gives you no output after entering a command, it means the command succeeded. If it succeeded you can see the data by typing spruce at the command-line which should display the entire dataset. If you need to download R, you can go to the R project website. You can download a CSV (comma separated values) version of the spruce R data set. The size of this file is about 27,221 bytes. Log-size of 79 Sitka spruce treesDescriptionThe Usagedata(spruce) FormatThis data frame contains the following columns:
SourceDiggle, P.J., Liang, K.Y., and Zeger, S.L. (1994) Analysis of Longitudinal Data, Clarendon Press. Examplesdata(spruce) spruce$contr <- ifelse(spruce$ozone=="enriched", 0, 1) sitka88 <- spruce[spruce$wave <= 5,] sitka89 <- spruce[spruce$wave > 5,] fit.88 <- geese(logsize ~ as.factor(wave) + contr + I(time/100*contr) - 1, id=id, data=sitka88, corstr="ar1") summary(fit.88)fit.89 <- geese(logsize ~ as.factor(wave) + contr - 1, id=id, data=sitka89, corstr="ar1") summary(fit.89) -- Dataset imported from https://www.r-project.org. |
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