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help for ^iclassr2^
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Intra-class correlation for paired measures [STB-35 sg65]
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^iclassr^ response_var1 response_var2 [^if^ exp] [^in^ range] [^, c^enter^(^Fpos^)^]
Description
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^iclassr2^ calculates the intra-class correlation for paired measurements or as-
sessments stored in response_var1 and response_var2. ^iclassr2^ also reports the
reliability of the mean of the two measurements as estimated from the Spearman-
Brown prophecy formula. Missing values are handled by casewise deletion.
@loneway@ also calculates intra-class correlations, but requires data in long,
rather than wide format. ^iclassr2^ is also much faster than ^loneway^, and offers
a small sample adjustment to the intra-class r; see the option ^center^, below.
Options
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^center^ chooses a reference point in the F distribution to center the observed
F statistic in estimating the intra-class correlation. The argument Fpos
may be 1 (the default), or "med" or "mean" to choose the median or the mean
of the appropriate F distribution. This option has little effect unless the
number of pairs is small.
Examples
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. ^iclassr2 judge1 judge2^ (inter-judge reliability)
. ^iclassr2 judge1 judge2, c(med)^ (intra-judge reliability, center the ob-
served F on its median)
Also see
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STB: sg65 (STB-35)
Manual: ^[R] loneway^
On-line: help for @loneway@