add combine in ch9

2022-03-24 20:09:55 +01:00 · 2022-03-24 20:09:55 +01:00 · c1b56b22b0
commit c1b56b22b0
parent de5d3d5b57
1 changed files with 2 additions and 0 deletions
--- a/ch09.jl
+++ b/ch09.jl
@ -157,3 +157,5 @@ ratings_predict = float.(sort(ratings))
 popularity_predict = predict(model, ratings_predict)

 plot!(ratings_predict, popularity_predict; width=5, color="black")
+
+combine(groupby(good, :Rating), :Popularity => mean)