The original poster saw little difference in R-squared between
-collin- (which is equivalent to -reg-) and _-svy: reg-.
Probability weights do ordinarily, affect R-square, but weights with
a low CV would not have much impact. Unfortunately the poster didn't
provide even minimal numerical description. From the FAQ Section
5.3: "Say exactly what you typed and exactly what Stata typed (or
did) in response. N.B. exactly! "
-Steve
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