citations {BradleyTerry} | R Documentation |
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).
data(citations)
A data frame with 16 observations on the following 3 variables.
winner
Biometrika
Comm Statist
JASA
JRSS-B
loser
Biometrika
Comm Statist
JASA
JRSS-B
Freq
"winner" is the cited journal, "loser" the one doing the citing.
Agresti, A (2002) Categorical Data Analysis (2nd ed). New York: Wiley.
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.
data(citations) ## Data as a square table, as in Agresti p448 xtabs(Freq ~ ., citations) ## Standard Bradley-Terry model fitted to these data BTm(citations ~ ..)