[Python-Dev] PEP 450 adding statistics module
tjreedy at udel.edu
Mon Sep 9 09:30:15 CEST 2013
On 9/8/2013 10:57 PM, Stephen J. Turnbull wrote:
> I don't necessarily find this persuasive. It's more common when
> working with existing databases that you add variables than add
My experience with general scientific research is the opposite. One
decides on the variables to measure and then adds rows (records) of data
as you measure each experimental or observational subject. New
calculated variables may be added (and often are) after the data
collection is complete (at least for the moment).
Time series analysis is a distinct and specialized subfield of
statistics. The corresponding data collections is often different: one
may start with a fixed set of subjects (50 US states for instance) and
add 'variables' (population in year X) indefinitely. Much economic
statistics is in this category.
A third category is interaction analysis, where the data form a true
matrix where both rows and columns represent subjects and entries
represent interaction (how many times John emailed Joe, for instance).
Terry Jan Reedy
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