Dactyl R Documentation

## Edgeworth's counts of dactyls in Virgil's Aeneid

### Description

Edgeworth (1885) took the first 75 lines in Book XI of Virgil's Aeneid and classified each of the first four "feet" of the line as a dactyl (one long syllable followed by two short ones) or not.

Grouping the lines in blocks of five gave a 4 x 25 table of counts, represented here as a data frame with ordered factors, `Foot` and `Lines`. Edgeworth used this table in what was among the first examples of analysis of variance applied to a two-way classification.

### Usage

`data(Dactyl)`

### Format

A data frame with 60 observations on the following 3 variables.

`Foot`

an ordered factor with levels `1` < `2` < `3` < `4`

`Lines`

an ordered factor with levels `1:5` < `6:10` < `11:15` < `16:20` < `21:25` < `26:30` < `31:35` < `36:40` < `41:45` < `46:50` < `51:55` < `56:60` < `61:65` < `66:70` < `71:75`

`count`

number of dactyls

### Source

Stigler, S. (1999) Statistics on the Table Cambridge, MA: Harvard University Press, table 5.1.

### References

Edgeworth, F. Y. (1885). On methods of ascertaining variations in the rate of births, deaths and marriages. Journal of the [Royal] Statistical Society, 48, 628-649.

### Examples

```data(Dactyl)

# display the basic table
xtabs(count ~ Foot+Lines, data=Dactyl)

# simple two-way anova
anova(dact.lm <- lm(count ~ Foot+Lines, data=Dactyl))

# plot the lm-quartet
op <- par(mfrow=c(2,2))
plot(dact.lm)
par(op)

# show table as a simple mosaicplot