Hi everyone, i don't get the qqplot which is used to test if the sample followed a t-distribution?
qqplot(qt(ppoints(z), df = 7.6), z, xlab = "Q-Q plot for t dsn") qqline(z) what qt() means? what ppoints() means? I know qqnorm() will plots the data in the way of normal distribution. how to make the qqplot to plot the data in the form of t-distribution? Or is there any command can actually test if the imput data is t-distribution? like the shapiro.test(x) used to test the normality. Thank you so much, guys. Sincerely, Bill ----- Original Message ----- From: Michael Bedward <michael.bedw...@gmail.com> Date: Friday, December 3, 2010 7:48 pm Subject: Re: [R] testing and ploting t-distribution To: 5...@queensu.ca Cc: r-help@r-project.org > Hello Bill, > > Have a look at the example at the bottom of the help page for ?qqplot > > Michael > > > On 4 December 2010 11:19, <5...@queensu.ca> wrote: > > Hi there, > > > > > > I am doing a test to see the the residual is distributed in > the form of t-distribution and trying to plot the residuals and > the t-distribution to compare in the graph. > > > > Cheers, > > > > Bill > > > > > > > > ----- Original Message ----- > > From: r-help-requ...@r-project.org > > Date: Wednesday, December 1, 2010 1:29 am > > Subject: confirm 1f8ffd55c611e2b0ed4ed4d2b79a8d9b30182a95 > > To: 5...@queensu.ca > > > >> Mailing list subscription confirmation notice for mailing > list R-help > >> > >> We have received a request from 129.132.148.130 for > subscription of > >> your email address, "5...@queensu.ca", to the r-help@r-project.org > >> mailing list. To confirm that you want to be added to this > >> mailinglist, simply reply to this message, keeping the > Subject: header > >> intact. Or visit this web page: > >> > >> https://stat.ethz.ch/mailman/confirm/r- > >> help/1f8ffd55c611e2b0ed4ed4d2b79a8d9b30182a95 > >> > >> Or include the following line -- and only the following line - > - > >> in a > >> message to r-help-requ...@r-project.org: > >> > >> confirm 1f8ffd55c611e2b0ed4ed4d2b79a8d9b30182a95 > >> > >> Note that simply sending a `reply' to this message should > work from > >> most mail readers, since that usually leaves the Subject: line > >> in the > >> right form (additional "Re:" text in the Subject: is okay). > >> > >> If you do not wish to be subscribed to this list, please simply > >> disregard this message. If you think you are being maliciously > >> subscribed to the list, or have any other questions, send > them to > >> r-help-ow...@r-project.org. > >> > > > > [[alternative HTML version deleted]] > > > > > > ______________________________________________ > > R-help@r-project.org mailing list > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide http://www.R- > project.org/posting-guide.html > > and provide commented, minimal, self-contained, reproducible code. > > > > > [[alternative HTML version deleted]]
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