?predict.lm -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare greg.s...@imail.org 801.408.8111
> -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r- > project.org] On Behalf Of Ricardo Gomez > Sent: Wednesday, December 17, 2008 8:47 AM > To: R-help@r-project.org > Subject: [R] PREDICT NEW VALUES FROM REGRESSION MODEL, EST. ST.ERROR, > AND CI > > > Greetings, > > I'd be grateful if a good Samaritan helps me to approach this > problem.... > > with my data, I've created the following model > > lm(formula = OUTCOME ~ VAR1 + VAR2) > summary(model) > > Call: > lm(formula = OUTCOME ~ VAR1 + VAR2) > > Residuals: > Min 1Q Median 3Q Max > -1.4341 -0.3621 0.1879 0.4994 0.7696 > > Coefficients: > Estimate Std. Error t value Pr(>|t|) > (Intercept) 1.89020 0.26826 7.046 5.92e-07 *** > VAR1 0.04725 0.06001 0.787 0.440 > VAR2 0.04139 0.05655 0.732 0.472 > > Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 > > Residual standard error: 0.6618 on 21 degrees of freedom > Multiple R-squared: 0.9474, Adjusted R-squared: 0.9424 > F-statistic: 189.2 on 2 and 21 DF, p-value: 3.696e-14 > > but now, I need to predict OUTCOME (Y) when VAR1=8 and VAR2 =64; > estimate the standard error of the predicted value, and construct a 95% > CI > > Your help is much appreciated > > RG > ***************************************** > Ricardo L Gomez > Center for International Education > University of Massachusetts-Amherst > Telephone: (413)545-0465 | Fax: (413)545-1263 > Web Address http://www.umass.edu/cie > E-mail: c...@educ.umass.edu > > > > Get the world's best email - http://nz.mail.yahoo.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. ______________________________________________ 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.