Update documentation on @regress

src/macros.jl

@@ -74,6 +74,8 @@ end
     @regress y x1 x2 ... [@if condition], [robust] [cluster(var1, var2, ...)]
 
 Estimate a regression model in `df` with dependent variable `y` and independent variables `x1`, `x2`, etc. If `condition` is provided, the operation is executed only on rows for which the condition is true. If `robust` is provided, robust standard errors are calculated. If `cluster` is provided, clustered standard errors are calculated.
+
+The regression is limited to rows for which all variables are values. Missing values, infinity, and NaN are automatically excluded.
 """
 macro regress(exprs...)
     :regress |> parse(exprs) |> rewrite

src/side_effects.jl

@@ -33,8 +33,12 @@ function rewrite(::Val{:regress}, command::Command)
     # validate everything except fixed effects
     to_validate = [x for x in arguments if get_top_symbol(x) != :fe]
     additional_condition = build_bitmask(target_df, :(Kezdi.isvalue($(to_validate...))))
+    nobs_to_drop = 
     quote
         $setup
+        if sum(.!$additional_condition) > 0
+            display("Dropping $(sum(.!$additional_condition)) row(s) due to missing values.")
+        end
         if length($(arguments[2:end])) == 1
             reg(view($target_df, $additional_condition, :), @formula($(arguments[1]) ~ $(arguments[2])), $vcov) |> $teardown
         else