add combine in ch9
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ch09.jl
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ch09.jl
@ -157,3 +157,5 @@ ratings_predict = float.(sort(ratings))
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popularity_predict = predict(model, ratings_predict)
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popularity_predict = predict(model, ratings_predict)
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plot!(ratings_predict, popularity_predict; width=5, color="black")
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plot!(ratings_predict, popularity_predict; width=5, color="black")
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combine(groupby(good, :Rating), :Popularity => mean)
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