Hi all, is regression through the origin possible at all using lmodel2?
I tried the standard technique of inserting a minus 1 into the formula to get regression through the origin in R, but the output still gives me an intercept? For comparison, this is me trying to do regression through the origin: > test2.res<-lmodel2(mcr~m-1, data=test, "interval", "interval", nperm=99) > test2.res Model II regression Call: lmodel2(formula = mcr ~ m - 1, data = test, range.y = "interval", range.x = "interval", nperm = 99) n = 13 r = 0.9801157 r-square = 0.9606268 Parametric P-values: 2-tailed = 4.491109e-09 1-tailed = 2.245554e-09 Angle between the two OLS regression lines = 0.440334 degrees Permutation tests of OLS, MA, RMA slopes: 1-tailed, tail corresponding to sign A permutation test of r is equivalent to a permutation test of the OLS slope P-perm for SMA = NA because the SMA slope cannot be tested Regression results Method Intercept Slope Angle (degrees) P-perm (1-tailed) 1 OLS -0.1053969 4.928172 78.52957 0.01 2 MA -0.1261714 5.122467 78.95373 0.01 3 SMA -0.1160872 5.028153 78.75177 NA 4 RMA -0.1167458 5.034313 78.76519 0.01 and below is the output and formula input when I omit the -1. Does lmodel2 function/ package not understand what I want? > test1.res<-lmodel2(mcr~m, data=test, "interval", "interval", nperm=99) > test1.res Model II regression Call: lmodel2(formula = mcr ~ m, data = test, range.y = "interval", range.x = "interval", nperm = 99) n = 13 r = 0.9801157 r-square = 0.9606268 Parametric P-values: 2-tailed = 4.491109e-09 1-tailed = 2.245554e-09 Angle between the two OLS regression lines = 0.440334 degrees Permutation tests of OLS, MA, RMA slopes: 1-tailed, tail corresponding to sign A permutation test of r is equivalent to a permutation test of the OLS slope P-perm for SMA = NA because the SMA slope cannot be tested Regression results Method Intercept Slope Angle (degrees) P-perm (1-tailed) 1 OLS -0.1053969 4.928172 78.52957 0.01 2 MA -0.1261714 5.122467 78.95373 0.01 3 SMA -0.1160872 5.028153 78.75177 NA 4 RMA -0.1167458 5.034313 78.76519 0.01 Ned -- View this message in context: http://www.nabble.com/lmodel2---regression-through-origin--tp23646915p23646915.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.
