{smcl} {* 25jan2006}{...} {hline} help for {hi:heterogi} {hline} {title:Heterogeneity measures} {p 4 14 10}{cmd:heterogi} {it:#Q} {it:#df} [{cmd:,} {cmdab:l:evel(}{it:#}{cmd:)} {cmdab:f:ormat(%}{it:fmt}{cmd:)} {cmdab:nc:chi2} ]{p_end} {p 4 14 10} where {p_end} {p 4 14 10}{it:#Q} is the Cochran's Chi-Square or Q-test {p_end} {p 4 14 10}{it:#df} is the degrees of freedom {p_end} {title:Description} {p 4 10 10}{cmd:heterogi} provides the statistics H and I^2 to quantify heterogeneity in a meta-analysis. {title:Remark} {p 4 10 10}It is an immediate command, see help {help immed}. The Q-test can be obtained by {help metan} or {help meta} command.{p_end} {title:Options} {p 4 8 2}{cmdab:l:evel(}{it:#}{cmd:)} specifies the width of the confidence interval; see help {help level}.{p_end} {p 4 8 2}{cmdab:f:ormat(%}{it:fmt}{cmd:)} specifies the display format for presenting numbers in the table's cells.{p_end} {p 4 8 2}{cmdab:nc:chi2} specifies the use of the noncentral chi-squared distribution to calculate confidence intervals. The default is the test-based confidence interval (Higgins and Thompson, 2002).{p_end} {title:Examples} . {stata "heterogi 14.4 24"} . {stata "heterogi 14.4 24, level(99)"} . {stata "heterogi 14.1 11, nc"} . {stata "heterogi 81.5 19, nc f(%3.2f)"} . {stata "heterogi 41.5 7"} . {stata "heterogi 130.3 3"} {title:Authors} {p 4 4 2}Nicola Orsini, Division of Nutritional Epidemiology, IMM, Karolinska Institutet, Sweden {p_end} {p 4 4 2}Julian P.T. Higgins, MRC Biostatistics Unit, Cambridge, UK {p_end} {p 4 4 2}Matteo Bottai, Arnold School of Public Health, University of South Carolina, USA {p_end} {p 4 4 2}Iain Buchan, Northwest Institute for Bio-Health Informatics, University of Manchester, UK {p_end} {title:Reference} {p 4 4 2}Higgins J.P.T. and Thompson S.G., {it:Quantifying heterogeneity in a meta-analysis}, Statistics in Medicine, 2002, 21: 1539-1558{p_end} {title:Support} {p 4 12}{browse "http://nicolaorsini.altervista.org"}{p_end} {p 4 12}{browse "mailto:nicola.orsini@ki.se?subject=info heterogi":nicola.orsini@ki.se} {title:Also see} {p 0 19}On-line: help for {help metan}, {help meta} (if installed) {p_end}