search for: se_z

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2009 Aug 27
1
standard error associated with correlation coefficient
I want the standard error associated with a correlation. I can calculate using cor & var, but am wondering if there are libraries that already provide this function. [[alternative HTML version deleted]]
2009 Feb 13
2
Meta-Analyisis on Correlations
Dear R-Community, I'm currently trying to find a way to conduct a meta-analysis in R. I would like to analyze data from mostly-cross-sectional survey-studies. The effect sizes would be correlations. The R packages "meta" and "rmeta" are, as far as I can see, set up for analysis with effect sizes for differences (i.e. comparison of the means/odds-ratios of experimental
2009 Sep 01
1
Logistic Politomic Regression in R
...lp@r-project.org> Message-ID:     <f2faed070908301053g4bab9b95n681b31d0ace49300@mail.gmail..com> Content-Type: text/plain Here are some options for confidence intervals. #by hand sample_r <- .5 n_sample <- 100 df <- n_sample-1 fisher_z <- 0.5*(log(1+sample_r)-log(1-sample_r)) se_z <- 1/sqrt(n_sample-3) t_crit <- qt(.975,df ,lower.tail=TRUE) z_lci <- fisher_z - (t_crit * se_z) z_uci <- fisher_z + (t_crit * se_z) (r_lci <- tanh(z_lci)) (r_uci <- tanh(z_uci)) # Compare to the CIr function in psychometric library #that uses standard normal instead of t librar...