Extracting information from lm results
Dear all, Thank you very much for all of your suggestions! You've all been very helpful. I'll go and try some of your code out! all the best Steve Dr Stephen Thackeray Lake Ecosystem Group CEH Lancaster Lancaster Environment Centre Library Avenue Bailrigg Lancaster LA1 4AP Email: sjtr at ceh.ac.uk Tel: +44 (0) 1524 595852 Fax: +44 (0) 1524 61536 Disclaimer: Any views or opinions expressed in this mail or any files transmitted with it are those of the author and do not represent the views of NERC unless otherwise explicitly stated. The information contained in this email may be subject to public disclosure under the Freedom of Information Act 2000. Unless the information is legally exempt from disclosure, the confidentiality of this e-mail and your reply cannot be guaranteed.
Christoph Meyer <christoph.meyer at uni-ulm.de> 10:06 02/05/2008 >>>
Hi Steve, you can extract this information from the summary of your linear regressions, i.e. summary(lm1). e.g. sum.lm1=summary(lm1) sum.lm1$coef[2,2] #this gives you the SE of the slope sum.lm1$r.squared #this gives you the R2 and so on... This should be clear from a look at str(sum.lm1). Hope that helps, Christoph
Friday, May 2, 2008, 9:55:10 AM, you wrote:
Dear all,
I suspect that this might be a bit basic, but here goes anyway...
I am soon to run a large number of linear regressions and I would like to extract a number of details from the models, and then collate them in a dataframe as a summary of the overall block of analyses. I can successfully extract the intercept and slope by using, for example:
lm1<-lm(ASTF~Year,na.action=na.omit,subset=yr10==T)
a1<-lm1$coefficients[1]
b1<-lm1$coefficients[2]
out1<-cbind("ASTF","1996-2005",lm1$coefficients[1],lm1$coefficients[2])
However, I also would like to extract the following too:
1) the number of data points in the analysis, n 2) the standard error of the slope 3) the P value 4) the R-squared value
Is it possible to extract these parameters in the same way as the slope and intercept, to save a lot of typing?
Any help much appreciated!
Steve Thackeray
Dr Stephen Thackeray Lake Ecosystem Group CEH Lancaster Lancaster Environment Centre Library Avenue Bailrigg Lancaster LA1 4AP
Email: sjtr at ceh.ac.uk Tel: +44 (0) 1524 595852 Fax: +44 (0) 1524 61536
Disclaimer: Any views or opinions expressed in this mail or any files transmitted with it are those of the author and do not represent the views of NERC unless otherwise explicitly stated. The information contained in this email may be subject to public disclosure under the Freedom of Information Act 2000. Unless the information is legally exempt from disclosure, the confidentiality of this e-mail and your reply cannot be guaranteed.
*************************************************************** Dr. Christoph Meyer Institute of Experimental Ecology University of Ulm Albert-Einstein-Allee 11 D-89069 Ulm Germany Phone: ++49-(0)731-502-2675 Fax: ++49-(0)731-502-2683 Mobile: ++49-(0)1577-156-7049 E-mail: christoph.meyer at uni-ulm.de http://www.uni-ulm.de/nawi/nawi-bio3.html ***************************************************************
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