R Dataset / Package lme4 / grouseticks
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dataset-86658.csv | 17.88 KB |
Documentation |
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On this Picostat.com statistics page, you will find information about the grouseticks data set which pertains to Data on red grouse ticks from Elston et al. 2001. The grouseticks data set is found in the lme4 R package. Try to load the grouseticks data set in R by issuing the following command at the console data("grouseticks"). This may load the data into a variable called grouseticks. If R says the grouseticks data set is not found, you can try installing the package by issuing this command install.packages("lme4") and then attempt to reload the data with library("lme4") followed by data("grouseticks"). 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 grouseticks 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 grouseticks R data set. The size of this file is about 18,311 bytes. Data on red grouse ticks from Elston et al. 2001DescriptionNumber of ticks on the heads of red grouse chicks
sampled in the field ( Usagedata(grouseticks) Format
Details
SourceRobert Moss, via David Elston ReferencesElston, D. A., R. Moss, T. Boulinier, C. Arrowsmith, and X. Lambin. 2001. "Analysis of Aggregation, a Worked Example: Numbers of Ticks on Red Grouse Chicks." Parasitology 122 (05): 563-569. doi:10.1017/S0031182001007740. http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=82701. Examplesdata(grouseticks) ## Figure 1a from Elston et al par(las=1,bty="l") tvec <- c(0,1,2,5,20,40,80) pvec <- c(4,1,3) with(grouseticks_agg,plot(1+meanTICKS~HEIGHT, pch=pvec[factor(YEAR)], log="y",axes=FALSE, xlab="Altitude (m)", ylab="Brood mean ticks")) axis(side=1) axis(side=2,at=tvec+1,label=tvec) box() abline(v=405,lty=2) ## Figure 1b with(grouseticks_agg,plot(varTICKS~meanTICKS, pch=4, xlab="Brood mean ticks", ylab="Within-brood variance")) curve(1*x,from=0,to=70,add=TRUE) ## Model fitting form <- TICKS~YEAR+HEIGHT+(1|BROOD)+(1|INDEX)+(1|LOCATION) (full_mod1 <- glmer(form, family="poisson",data=grouseticks)) -- Dataset imported from https://www.r-project.org. |
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R Output | Date |
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Picostat Output - Simple Linear Regression | May 20, 2019 |
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