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Create a BLP formulation

Usage

blp_formulation(formula, absorb = NULL)

Arguments

formula

Formula string (e.g., "1 + prices + sugar") or R formula

absorb

Optional formula for absorbed fixed effects (e.g., "~ product_id")

Value

A BLPFormulation object

Examples

f1 <- blp_formulation("1 + prices + sugar + mushy")
f2 <- blp_formulation("0 + prices", absorb = "~ product_ids")