I wish I had started with "I am disappointed that lm() doesn't continue its 
search for weights into the calling environment" or "the fact that lm() looks 
only in the formula environment and data frame for weights doesn't seem 
consistent with how other values are treated."

But I did not. So I do apologize for both that and for negative tone on my part.


Simplified example:

d <- data.frame(x = 1:3, y = c(1, 2, 1))
w <- c(1, 10, 1)
f <- as.formula(y ~ x)
lm(f, data = d, weights = w)  # works

# fails
environment(f) <- baseenv()
lm(f, data = d, weights = w)
# Error in eval(extras, data, env) : object 'w' not found


> On Aug 9, 2020, at 11:56 AM, Duncan Murdoch <murdoch.dun...@gmail.com> wrote:
> 
> This is fairly clearly documented in ?lm:
> 

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