There are three kinds of lies: lies, damned lies, and statistics -Marky Mark Twain
An observation (~individual) defined:
http://epp.eurostat.ec.europa.eu/statistics_explained/index.php/Glossary:Observation_unit
A sample (~population) defined:
http://www.stats.gla.ac.uk/steps/glossary/sampling.html
"PCA principle components analysis is regression in more than two dimensions" - Francisco Moore
Repeated measures will be revisited and can be seen here:
http://biostat.mc.vanderbilt.edu/wiki/pub/Main/ClinStat/repmeas.PDF
Types of variables:
http://www.unesco.org/webworld/idams/advguide/Chapt1_3.htm
Meristic for fish people:
http://en.wikipedia.org/wiki/Meristics
A paper on error and philosophy:
http://www.ets.org/Media/Research/pdf/PICANG12.pdf
'Never ever ever ever ever used a derived variable in stats. Unless you have to. Distributions get wonky. ' paraphrased -Francisco B.G. Moore the University of Akron Summit on Statistical Analysis 1-16-13
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