Return lag coefficient scale matrix, S. S should be invertable.
Typically users should only interact with
estimands functions (with the argument
scaled = TRUE).
1 2 3 4
a fitted model object
If θ is the vector of unscaled regression coefficients, then corresponding distributed lag terms in the vector S * θ can be interpreted as average regression coefficients up to their associated radius. Non-DL coefficients are unchanged by this transformation.
A square numeric matrix represented as a
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