my previous remarks were about other sampling designs. I was comaring valid complex designs to SRS design and not non-sampling case selection. dennis roberts wrote: > my hypothesis of course is that more often than not ... in data collection > problems where sampling is involved AND inferences are desired ... we goof > far more often ... than do a better than SRS job of sampling > > 1. i wonder if anyone has really taken a SRS of the literature ... maybe > stratified by journals or disciplines ... and tried to see to what extent > sampling in the investigations was done via SRS ... better than that ... or > worse than that??? of course, i would expect even if this is done ... we > would have a + biased figure ... since, the notion is that only the > better/best of the submitted stuff gets published so, the figures for all > stuff that is done (ie, the day in day out batch), published or not ... > would have to look worse off ... > > 2. can worse than SRS ... be as MUCH worse ... as complex sampling plans > can be better than SRS??? that is ... could a standard error for a bad > sampling plan (if we could even estimate it) ... be proportionately as much > LARGER than the standard error for SRS samples ... as complex sampling > plans can produce standard errors that are as proportionately SMALLER than > SRS samples? are there ANY data that exist on this matter? > > ============================================================== > dennis roberts, penn state university > educational psychology, 8148632401 > http://roberts.ed.psu.edu/users/droberts/drober~1.htm > > ================================================================= > Instructions for joining and leaving this list and remarks about > the problem of INAPPROPRIATE MESSAGES are available at > http://jse.stat.ncsu.edu/ > ================================================================= ================================================================= Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =================================================================
