variable "weight" not contained in child_labor.rda

[linc0380]

Dear Jeffrey,

when running render_book("index.Rmd") the compilation runs smoothly up until the stage processing file: child-labor.Rmd where it stops as it cannot find the weight object:

Quitting from lines 54-57 (child-labor.Rmd)
Error in eval(extras, data, env) : object 'weight' not found
Calls: local ... eval -> <Anonymous> -> model.frame.default -> eval -> eval

Execution halted
Error in Rscript_render(f, render_args, render_meta) :
  Failed to compile child-labor.Rmd

I believe this is because the variable is not created in child_labour.rda since data("child_labor", package = "masteringmetrics") yields

head(child_labor)
   yob year sob indEduc lnwkwage   cl7   cl8   cl9
1 1907 1950   1       4 3.885355 FALSE FALSE FALSE
2 1908 1950   1       7 4.251239 FALSE FALSE FALSE
3 1908 1950   1      10 4.232931 FALSE FALSE FALSE
4 1908 1950   1       8 1.570217 FALSE FALSE FALSE
5 1908 1950   1       8 4.230477 FALSE FALSE FALSE
6 1907 1950  22      10 4.114964  TRUE FALSE FALSE

while the original Stata file http://masteringmetrics.com/wp-content/uploads/2015/02/AA_small.dta_.zip does contain weight.

Could you look into this issue please? Thanks!

Regards,
Michael