Hi Folks, I am trying to teach myself how to solve the problem described below but am running out of time. Hence the plea for help. Thanks in advance.
Here is my data frame. > t # A tibble: 12 x 12 subject ageGrp ear hearingGrp sex freq L2 Ldp Phidp NF SNR Ldp_p <fct> <fct> <fct> <fct> <fct> <int> <int> <dbl> <dbl> <dbl> <dbl> <dbl> 1 HALAF573 A L A F 2 0 -19.6 197. -28.5 8.88 2.10e-6 2 HALAF573 A L A F 2 2 -18.7 203. -22.0 3.25 2.31e-6 3 HALAF573 A L A F 2 4 -29.1 255. -27.4 -1.64 7.04e-7 4 HALAF573 A L A F 2 6 -12.4 174. -12.2 -0.206 4.78e-6 5 HALAF573 A L A F 4 0 -28.6 232. -26.7 -1.87 7.45e-7 6 HALAF573 A L A F 4 2 -27.2 351. -28.8 1.59 8.68e-7 7 HALAF573 A L A F 4 4 -20.4 26.2 -35.0 14.6 1.92e-6 8 HALAF573 A L A F 4 6 -20.0 85.1 -29.8 9.75 2.00e-6 9 HALAF573 A L A F 8 0 -22.8 39.2 -22.1 -0.689 1.45e-6 10 HALAF573 A L A F 8 2 -14.5 13.4 -20.7 6.23 3.76e-6 11 HALAF573 A L A F 8 4 -17.3 345. -21.6 4.30 2.73e-6 12 HALAF573 A L A F 8 6 -14.1 320. -21.7 7.59 3.94e-6 # Note that there are more levels of L2 (31 in total) and 344 other subjects but I truncated the frame for posting. # I want to do this: t %>% group_by(freq) %>% [run segmented] %>% [create a data frame with [subject, freq, breakpoint1, breakpoint2, slope1, slope2, slope3, L2 when Ldp_p == 0]. # Also note that ultimately I will be grouping by "subject, freq". # I can run the models and get believable results. The following run on a data frame with L2 between 0 and 60. out.lm <- lm(Ldp_p ~ L2, data = t) o <- segmented(out.lm, seg.Z = ~L2, psi = list(L2 = c(20,45)), control = seg.control(display = FALSE) o$psi # Initial Est. St.Err #psi1.L2 20 30.78256 0.5085192 #psi2.L2 45 53.16390 0.4671701 slope(o) slope(o) $L2 # Est. St.Err. t value CI(95%).l CI(95%).u #slope1 1.2060e-06 1.6606e-07 7.2622 8.6397e-07 1.5480e-06 #slope2 1.0708e-05 2.9196e-07 36.6770 1.0107e-05 1.1309e-05 #slope3 -4.5791e-06 1.3694e-06 -3.3439 -7.3995e-06 -1.7588e-06 Thanks again for bailing me out. Regards, Sumit [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.