search for: logweight

...ibed in "Estimation of absolute risk from nested case-control data" by Langholz and Borgan (1997) where Horvitz-Thompson sampling weight (log of (number in the risk set divided by the number sampled)) is used with regression. In SAS Proc Phreg, this is implemented as an offset (offset=logweight). I checked clogistic() in Epi package and clogit() in survival package, but couldn't figure out how to incorporate this weighting with either. Also when considering nested case-control sampling for Cox proportional hazards model, the above method can estimate absolute risk of developing...

I have data that looks like lake,loglength,logweight 1,2.369215857,1.929418926 1,2.426511261,2.230448921 1,2.434568904,2.298853076 1,2.437750563,2.298853076 1,2.442479769,2.230448921 1,2.445604203,2.356025857 ... 102,2.722633923,3.310268367 102,2.781755375,3.502153893 102,2.836324116,3.683407299 102,2.802773725,3.583312152 102,2.790285164,3.546419267...

hello. I'm a student that work on R.(version 1.7.0) I need to some data frames such as "possum","Beams"'"kiwishade","dolphins",... . I typed help.search("possum") and so on,but the response was "No help files found with alias or title matching 'possum' using fuzzy matching.". I dont know what is "fuzzy matching"