So let's be clear: this was the 'offset' argument' and not the offset()
function as you refer to below.
It occurs for both
c1 <- structure(list(Contr = c(0.028, 0.043, 0.064, 0.097, 0.146, 0.219
), Correct = c(34L, 57L, 94L, 152L, 160L, 160L), Incorrect = c(126L,
103L, 66L, 8L, 0L, 0L)), .Names = c("Contr", "Correct", "Incorrect"
), row.names = c(NA, 6L), class = "data.frame")
glm(cbind(Correct, Incorrect) ~ Contr + offset(qlogis(0.25)) - 1, binomial,
data = c1)
Error in model.frame.default(formula = cbind(Correct, Incorrect) ~ Contr + :
variable lengths differ (found for 'offset(qlogis(0.25))')
+
Thanks for looking into this when time permits.
Ken
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--
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
Ken Knoblauch
Inserm U846
Stem-cell and Brain Research Institute
Department of Integrative Neurosciences
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69500 Bron
France
tel: +33 (0)4 72 91 34 77
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