Re: [R] Marginal effects from interaction regression model
On Jul 25, 2010, at 11:47 PM, Guillem R. wrote: As far as I know, the predict command gives the predicted values (and intervals) of y, but what I'm looking for is the conditional effects (betas) of x on y conditional on values of z. If you want the betas, then simply print the object. Don't for get the default parameterization is for treatment effects. I'm trying to produce a plot similar to the first shown in this link: http://homepages.nyu.edu/~mrg217/interaction.html#code If you want to provide an example ...and a more complete description of the desire output, I sure someone here can finish the job of showing you how setting up a call to predict will get you to that goal. -- David. Thanks again David Winsemius wrote: On Jul 25, 2010, at 10:24 PM, Guillem R. wrote: Dear all, I'd like to plot the marginal effect of a variable in a multiplicative interaction regression, that is, the effect of a variable conditional on the values of another variable. As an illustration, given model lm1 lm1 - lm(y ~ x*z) ? predict Perhaps: predict(lm1, newdata=data.frame(x=1:10, z=5), interval=confidence) I'd like to get the effects of x on y conditional on the values of z, with the corresponding confidence intervals if possible. Does anyone know of any package or simple way to do this? Thanks -- David Winsemius, MD West Hartford, CT __ 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. -- View this message in context: http://r.789695.n4.nabble.com/Marginal-effects-from-interaction-regression-model-tp2301858p2301884.html Sent from the R help mailing list archive at Nabble.com. __ 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. David Winsemius, MD West Hartford, CT __ 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.
Re: [R] Marginal effects from interaction regression model
The plots you are looking for are called 'effect plots'. See the effects package by John Fox. Guillem R. wrote: As far as I know, the predict command gives the predicted values (and intervals) of y, but what I'm looking for is the conditional effects (betas) of x on y conditional on values of z. I'm trying to produce a plot similar to the first shown in this link: http://homepages.nyu.edu/~mrg217/interaction.html#code Thanks again David Winsemius wrote: On Jul 25, 2010, at 10:24 PM, Guillem R. wrote: Dear all, I'd like to plot the marginal effect of a variable in a multiplicative interaction regression, that is, the effect of a variable conditional on the values of another variable. As an illustration, given model lm1 lm1 - lm(y ~ x*z) ? predict Perhaps: predict(lm1, newdata=data.frame(x=1:10, z=5), interval=confidence) I'd like to get the effects of x on y conditional on the values of z, with the corresponding confidence intervals if possible. Does anyone know of any package or simple way to do this? Thanks -- David Winsemius, MD West Hartford, CT __ 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. -- Michael Friendly Email: friendly AT yorku DOT ca Professor, Psychology Dept. York University Voice: 416 736-5115 x66249 Fax: 416 736-5814 4700 Keele StreetWeb: http://www.datavis.ca Toronto, ONT M3J 1P3 CANADA __ 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.
Re: [R] Marginal effects from interaction regression model
On Jul 25, 2010, at 10:24 PM, Guillem R. wrote: Dear all, I'd like to plot the marginal effect of a variable in a multiplicative interaction regression, that is, the effect of a variable conditional on the values of another variable. As an illustration, given model lm1 lm1 - lm(y ~ x*z) ? predict Perhaps: predict(lm1, newdata=data.frame(x=1:10, z=5), interval=confidence) I'd like to get the effects of x on y conditional on the values of z, with the corresponding confidence intervals if possible. Does anyone know of any package or simple way to do this? Thanks -- David Winsemius, MD West Hartford, CT __ 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.
Re: [R] Marginal effects from interaction regression model
As far as I know, the predict command gives the predicted values (and intervals) of y, but what I'm looking for is the conditional effects (betas) of x on y conditional on values of z. I'm trying to produce a plot similar to the first shown in this link: http://homepages.nyu.edu/~mrg217/interaction.html#code Thanks again David Winsemius wrote: On Jul 25, 2010, at 10:24 PM, Guillem R. wrote: Dear all, I'd like to plot the marginal effect of a variable in a multiplicative interaction regression, that is, the effect of a variable conditional on the values of another variable. As an illustration, given model lm1 lm1 - lm(y ~ x*z) ? predict Perhaps: predict(lm1, newdata=data.frame(x=1:10, z=5), interval=confidence) I'd like to get the effects of x on y conditional on the values of z, with the corresponding confidence intervals if possible. Does anyone know of any package or simple way to do this? Thanks -- David Winsemius, MD West Hartford, CT __ 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. -- View this message in context: http://r.789695.n4.nabble.com/Marginal-effects-from-interaction-regression-model-tp2301858p2301884.html Sent from the R help mailing list archive at Nabble.com. __ 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.
