[R] Computation of r.squared for weighted least squares linear models

[Sebastian Starke]

Hi,

recently I posted a question about how R computes the value for the 
"r.squared" statistic internally for weighted least squares linear 
models on crossvalidated.com (see: 
https://stats.stackexchange.com/questions/439590/how-does-r-compute-r-squared-for-weighted-least-squares) 
including a minimal code example but unfortunately did not get an answer.

I would greatly appreciate if any of you who know the answer could reply 
either here or directly on my post on crossvalidated.

Thanks a lot in advance!

-- 
Sebastian Starke

Computational Science Group (FWCC)
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