.- help for ^ci2^, ^cii2^ (STB 59 - sg159 PT Seed - paul.seed@@kcl.ac.uk) .- Confidence intervals for correlations ------------------------------------- ^ci2^ varname1 varname2 [^if^ exp] [^in^ range] [weight] [^, COrr SPearman^] ^cii2^ #n #corr [^, corr^] Description ----------- Without the ^corr^ or ^spear^ options, ^ci2^ and ^cii2^ behave as @ci@ and @cii@. With option ^corr^, ^ci2^ calculates the Pearson product moment correlation & produces a confidence interval, based on Fisher's transformation. As with @correlate@, ^ci2^ takes frequency and analytic weights. With option ^spearman^, (with or without ^corr^), Spearman's rank correlation is used. ^cii2^ is the immediate version. There is no separate Spearman option, because the method for finding the correlation is the same in both cases. Examples -------- Use for correlations . ^ci2 colorime icp , corr^ . ^ci2 colorime icp , corr spearman^ . ^ci2 colorime icp , spearman^ (Note: these last two are effectively the same.) . ^cii2 78 .52 , corr^ (78 paired observations, correlation 0.52) Use as ^ci^ and ^cii^ . ^ci2 mpg^ . ^ci2 mpg price, level(90)^ . ^ci2 promoted, binomial^ . ^ci2 count, poisson^ . ^ci2 deaths, exposure(pyears)^ . ^cii2 166 19509 4379^ (166 obs, mean=19509, sd=4379) . ^cii2 166 19509 4379, level(90)^ . ^cii2 10 1^ (10 binomial events, 1 observed success) . ^cii2 1 27, poisson^ (27 Poisson events observed) Also see -------- Manual: [R] correlate On-line: @correlate@, @pwcorr@