expected {epitools} | R Documentation |
Assuming independence, calculates expected values in a matrix or table.
expected(x)
x |
is a matrix or table |
Assuming independence, calculates expected values in a matrix or table.
expected values
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Tomas Aragon, aragon@berkeley.edu, http://www.medepi.com
Steve Selvin (2001), Epidemiologic Analysis: A Case-Oriented Approach, Oxford University Press
See also margin.table
##From Selvin, 2001, p.2 ##year = year of birth ##one+ = one or more congenital defects ##one = one congenital defect dat <- scan() 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)