search for: caliper

...er, the discussion about it took me back so vividly to the old days that, paranormally, I felt once again the urge to ascertain magnitudes as it used to be, and should be, done. I have therefore implemented, and hereby donate to the R community, a new function vernier() which implements the Venier Caliper. Its definition is below. Test it by entering vernier(pi+sqrt(.182)) By following the instructions you should find that the result is x = 3 Units + 5 Tenths + 7 Hundredths which is good enough for anyone. It generalises to non-decimal Vernier Calipers (change the default "n=10",...

...bor propensity score matching, using the MatchIt library: mout<-matchit(assignment~totalexp + yrschool+new+cert+age+STratio+percminority+urbanicity+povproblem+numthreats+numbattack, distance = "logit", replace = T, data = data, method = "nearest", m.order="largest", caliper = 0.10) 3. Just calculating the propensity scores using the glm function: ps.model = glm(assignment~totalexp + yrschool+new+cert+age+STratio+percminority+urbanicity+povproblem+numthreats+numbattack, family = "binomial", data = data) data$propensityscores = fitted(ps.model) In each case,...

...ath => /usr/sbin:/usr/bin:/usr/ccs/bin:/usr/contrib/bin:/usr/contrib/Q4/bin:/opt/perl/bin:/opt/gvsd/bin:/opt/ipf/bin:/opt/nettladm/bin:/opt/fcms/bin:/opt/wbem/bin:/opt/wbem/sbin:/opt/sas/bin:/opt/graphics/common/bin:/opt/atok/bin:/usr/bin/X11:/usr/contrib/bin/X11:/opt/sec_mgmt/bastille/bin:/opt/caliper/bin:/opt/drd/bin:/opt/dsau/bin:/opt/dsau/sbin:/opt/resmon/bin:/opt/firefox:/opt/gnome/bin:/opt/perf/bin:/opt/propplus/bin:/usr/contrib/kwdb/bin:/opt/perl_32/bin:/opt/prm/bin:/opt/sfm/bin:/opt/swm/bin:/opt/sec_mgmt/spc/bin:/opt/ssh/bin:/opt/swa/bin:/opt/hpsmh/bin:/opt/thunderbird:/opt/sentinel/bin:/...

Dear R users, I am trying to do exact matching on a large dataset (500.000 obs), about equal size of treatment and controll group, with replacement: As for the moment I use the "Match" function of the "Matching" library. I match on 2 covariates and all observations in the treatment group have at least one exact counterpart in the controllgroup. Now I want to introduce