Measurements made on Egyptian skulls from five epochs.
Usage
data("skulls")
Format
A data frame with 150 observations on the following 5 variables.
epoch
the epoch the skull as assigned to,
a factor with levels c4000BCc3300BC,
c1850BC, c200BC, and cAD150,
where the years are only given approximately, of
course.
mb
maximum breaths of the skull.
bh
basibregmatic heights of the skull.
bl
basialiveolar length of the skull.
nh
nasal heights of the skull.
Details
The question is whether the measurements change over time.
Non-constant measurements of the skulls over time would indicate
interbreeding with immigrant populations.
Source
D. J. Hand, F. Daly, A. D. Lunn, K. J. McConway and E. Ostrowski (1994).
A Handbook of Small Datasets, Chapman and Hall/CRC, London.
R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
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> library(HSAUR)
Loading required package: tools
> png(filename="/home/ddbj/snapshot/RGM3/R_CC/result/HSAUR/skulls.Rd_%03d_medium.png", width=480, height=480)
> ### Name: skulls
> ### Title: Egyptian Skulls
> ### Aliases: skulls
> ### Keywords: datasets
>
> ### ** Examples
>
>
> data("skulls", package = "HSAUR")
> means <- tapply(1:nrow(skulls), skulls$epoch, function(i)
+ apply(skulls[i,colnames(skulls)[-1]], 2, mean))
> means <- matrix(unlist(means), nrow = length(means), byrow = TRUE)
> colnames(means) <- colnames(skulls)[-1]
> rownames(means) <- levels(skulls$epoch)
> pairs(means,
+ panel = function(x, y) {
+ text(x, y, levels(skulls$epoch))
+ })
>
>
>
>
>
>
> dev.off()
null device
1
>