Thanks for that link to the article on L distributions. I don't think I quite got an L. Here's what the data looked like:
http://i.imgur.com/HtOCRc1.jpg But still, I'll take a look at the article since it addresses what to do with non-normal distributions. Michael A. Britt, Ph.D. [email protected] http://www.ThePsychFiles.com Twitter: @mbritt On Nov 11, 2013, at 1:29 PM, David Epstein <[email protected]> wrote: > On Mon, 11 Nov 2013, Michael Britt went: > >> I did a survey which asked respondents how satisfied they are in >> their current (romantic) relationship on a 1=10 point scale (where >> 10="very satisfied). While there was some variation, not >> surprisingly, the results are strongly negatively skewed. That makes >> sense - most people are probably satisfied with their relationships >> or they would leave the other person > > So you've got yourself the mirror image of one of these: > > <http://psycnet.apa.org/psycinfo/1983-09462-001> > > |The insidious L-shaped distribution. > |Bradley, James V. > |Bulletin of the Psychonomic Society, Vol 20(2), Aug 1982, 85-88. > | > |L-shaped distributions are probably more prevalent than generally > |realized. They are highly conducive to nonrobustness of > |normality-assuming statistical tests, and strongly resist > |transformation to normality. The thinner the tail of the > |distribution, the more unlikely it is that its L-shapedness will be > |detected by inspecting a sample drawn from it. Yet, as the tail of an > |L-shaped distribution becomes increasingly shallow, its skewness and > |kurtosis depart increasingly from their "normal-distribution" values, > |and the distribution becomes increasingly conducive to drastic > |nonrobustness. Worse, a fairly common type of experimental situation > |in psychological research produces shallow-tailed L-shaped > |distributions. > > If you do a search on statistical techniques for "zero-inflated > continuous [or semicontinuous] data," you might be able to apply them > to your "ten-inflated data." > > --David Epstein > [email protected] > > > --- > You are currently subscribed to tips as: [email protected]. > To unsubscribe click here: > http://fsulist.frostburg.edu/u?id=13405.0125141592fa9ededc665c55d9958f69&n=T&l=tips&o=30025 > or send a blank email to > leave-30025-13405.0125141592fa9ededc665c55d9958...@fsulist.frostburg.edu --- You are currently subscribed to tips as: [email protected]. To unsubscribe click here: http://fsulist.frostburg.edu/u?id=13090.68da6e6e5325aa33287ff385b70df5d5&n=T&l=tips&o=30032 or send a blank email to leave-30032-13090.68da6e6e5325aa33287ff385b70df...@fsulist.frostburg.edu
