prefmod (version 0.8-32)

baseball: Data (paired comparisons): Baseball Games

Description

The result of the 1987 season for seven baseball teams in the Eastern Division of the American League according to the (home team, away team) classification are shown.

Usage

baseball

encoding

UTF-8

format

Baseball is a numeric vector with the results for the season according to the (home team, away team) classification.

Details

The results of the seven teams Milwaukee, Detroit, Toronto, New York, Boston, Cleveland and Baltimore, that play 13 games each. There is no possibility of ending in a draw.

References

Alan Agresti, Categorical Data Analysis (Second Edition), 2002 pages 437 and 438 R. Dittrich, R. Hatzinger, and W. Katzenbeisser, Fitting paired comparison models in GLIM. GLIM newsletter 1997

Examples

# baseball example (Agresti, 2002, p. 437)

# pseudodata for generating a design matrix
d1 <- c(rep(0, 21), 1)
d2 <- c(1, rep(0, 20), 2)
d  <- data.frame(rbind(d1, d2))
names(d) <- c(paste0("v", 1:21), "cov")

# design matrix
des5 <- llbt.design(d, nitems = 7,
    objnames = c("MIL", "DET", "TOR", "NY", "BOS", "CLE", "BAL"),
    cat.scov = "cov")
des5$y  <- baseball
des5$mu <- gl(42, 2)
pos     <- c(rep(1:0, 21), rep(0:1, 21))

# fit model and display results
res5 <- gnm(y ~ MIL+DET+TOR+NY+BOS+CLE+BAL + pos,
    eliminate = mu, data = des5, family = poisson)
w5   <- llbt.worth(res5)
plot(w5)