Art Kendall wrote:
[snip good points]
> in your quasi-experiment you can possibly contrast different levels of specific
> pollutants, as well as kinds of pollutants, in different rivers at different
> times.
> I'm not a biologist, but I would be amazed if temperature did not affect
> population sizes.
Yeah, but would temperature also be related to pollultion levels, and if not, so
what if it is related to the outcome under study.
-Jay
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