I don't know, the help file is uninformative. I'd guess the answer is "the author wrote it that way". Other R functions like t.test include similar unfortunate (to me) default choices, in that case var.equal=FALSE (ie the Welch test) is the default.
albyn On Mon, Oct 25, 2010 at 04:15:20PM -0500, Laura Chihara wrote: > Yes, thank you for this reference. But according to > this article, the score is better than continuity > correction, so why is continuity correction the default > with prop.test? > > -Laura > > On 10/25/2010 4:02 PM, Ralph O'Brien, PhD wrote: > >I suggest: > > > >A. Agresti and B. A. Coull. Approximate is better than ”exact” for > >interval estimation of binomial proportions. The American Statistician, > >52(2):119–126, 1998. > > > > > > > > > > > > > > > >On Mon, Oct 25, 2010 at 4:38 PM, Laura Chihara <[email protected] > ><mailto:[email protected]>> wrote: > > > > Hi, > > > > I have a question about prop.test in R: > > > > I teach students the score confidence > > interval for proportions (also called > > Wilson or Wilson score interval). > > > > prop.test(,..., correct=FALSE) gives this > > interval. > > > > The default uses a continuity correction. > > When should we use one over the other? > > Is it worth going over this in class? Why > > is correct=TRUE the default? > > > > Thanks for any pedagogical guidance here! > > > > -- Laura > > > > ******************************************* > > Laura Chihara > > Professor of Mathematics 507-222-4065 (office) > > Dept of Mathematics 507-222-4312 (fax) > > Carleton College > > 1 North College Street > > Northfield MN 55057 > > > > _______________________________________________ > > [email protected] <mailto:[email protected]> > > mailing list > > https://stat.ethz.ch/mailman/listinfo/r-sig-teaching > > > > > > > > > >-- > >Ralph O'Brien, PhD > >Professor, Dept of Epidemiology and Biostatistics > >Case Western Reserve University > >Office: 216.368.1927 > >Cell: 216.312.3203 > > -- > ******************************************* > Laura Chihara > Professor of Mathematics 507-222-4065 (office) > Dept of Mathematics 507-222-4312 (fax) > Carleton College > 1 North College Street > Northfield MN 55057 > > _______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-sig-teaching > -- Albyn Jones Reed College [email protected] _______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-sig-teaching
