citations {BradleyTerry}R Documentation

Statistics journal citation data from Stigler (1994)

Description

Extracted from a larger table in Stigler (1994). Inter-journal citation counts for four journals, "Biometrika", "Comm Statist.", "JASA" and "JRSS-B", as used on p448 of Agresti (2002).

Usage

data(citations)

Format

A data frame with 16 observations on the following 3 variables.

winner
a factor with levels Biometrika Comm Statist JASA JRSS-B
loser
a factor with levels Biometrika Comm Statist JASA JRSS-B
Freq
a numeric vector

Details

"winner" is the cited journal, "loser" the one doing the citing.

Source

Agresti, A (2002) Categorical Data Analysis (2nd ed). New York: Wiley.

References

Firth, D. (2005) Bradley-Terry models in R. Journal of Statistical Software, to appear.

Stigler, S. (1994) Citation patterns in the journals of statistics and probability. Statistical Science 9, 94–108.

See Also

BTm

Examples

data(citations)
##  Data as a square table, as in Agresti p448
xtabs(Freq ~ ., citations)
## Standard Bradley-Terry model fitted to these data
BTm(citations ~ ..)

[Package BradleyTerry version 0.8-7 Index]