Last data update: 2014.03.03
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R: Compute the S fit statistic for a set of items
Compute the S fit statistic for a set of items
Description
Runs SitemFit1 for every item and accumulates
the results.
Usage
SitemFit(grp, ..., method = "pearson", log = TRUE, qwidth = 6,
qpoints = 49L, alt = FALSE, omit = 0L, .twotier = TRUE,
.parallel = TRUE)
Arguments
grp |
a list with spec, param, mean, cov, data, and the free variable pattern
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... |
Not used. Forces remaining arguments to be specified by name.
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method |
whether to use a pearson or rms test
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log |
whether to return pvalues in log units
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qwidth |
the positive width of the quadrature in Z units
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qpoints |
the number of quadrature points
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alt |
whether to include the item of interest in the denominator
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omit |
number of items to omit (a single number) or a list of the length the number of items
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.twotier |
whether to enable the two-tier optimization
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.parallel |
whether to take advantage of multiple CPUs (default TRUE)
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Value
a list of output from SitemFit1
Examples
grp <- list(spec=list())
grp$spec[1:20] <- rpf.grm()
grp$param <- sapply(grp$spec, rpf.rparam)
colnames(grp$param) <- paste("i", 1:20, sep="")
grp$mean <- 0
grp$cov <- diag(1)
grp$free <- grp$param != 0
grp$data <- rpf.sample(500, grp=grp)
SitemFit(grp)
Results
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