Description Usage Arguments Details Value Author(s) References See Also Examples
Assuming independence, calculates expected values in a matrix or table.
1 | expected(x)
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x |
is a matrix or table |
Assuming independence, calculates expected values in a matrix or table.
expected values
Tomas Aragon, aragon@berkeley.edu, http://www.phdata.science
Steve Selvin (2001), Epidemiologic Analysis: A Case-Oriented Approach, Oxford University Press
See also margin.table
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | ##From Selvin, 2001, p.2
##year = year of birth
##one+ = one or more congenital defects
##one = one congenital defect
dat <- c(369, 460, 434, 434, 506, 487, 521, 518, 526, 488,
605, 481, 649, 477, 733, 395, 688, 348)
##observed
oi <- matrix(dat, nrow =2)
colnames(oi) <- 1983:1991
rownames(oi) <- c("one+", "one")
##expected
ei <- expected(oi)
##Pearson chi-square test
chi2.T <- sum((oi - ei)^2/ei)
pchisq(q = chi2.T, df = 8, lower.tail = FALSE)
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