October 2017
Intermediate to advanced
480 pages
9h 49m
Japanese
Content preview from Rではじめるデータサイエンス
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19.2
なぜ低品質ダイヤモンドの方が高価なのか
335
最悪のダイヤモンドの色はJ（わずかに黄色）で最悪の透明度はI1（肉眼で内包物がわかる）なのに
注意します。
19.2.1
価格とカラット
重要な交絡変数、重さ（
carat
）があるために、低品質ダイヤモンドの価格が高いように見えます。
ダイヤモンドの重さは価格決定の最重要因子であり、低品質ダイヤモンドでは大きい傾向がありま
す。
ggplot(diamonds, aes(carat, price)) +
geom_hex(bins = 50)
carat
の影響を切り離してモデルに適合させて、他の属性が相対的
price
にどのように影響するか
をわかりやすくできます。まずはしかし、
diamonds
データセットを処理しやすいように変更を2 つ加
えます。
1. 2.5カラットより小さなダイヤモンド（データの99.7%）に焦点を絞る。
2. 変数
carat
と
price
を対数変換をする。
336
19
章 モデル構築
diamonds2 <- diamonds %>%
filter(carat <= 2.5) %>%
mutate(lprice = log2(price), lcarat = log2(carat))
これらの変更で
carat
と
price
の関係がわ ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.