June 2024
Intermediate to advanced
200 pages
4h 46m
Japanese
Content preview from Python2年生 データ分析のしくみ 第2版 体験してわかる！会話でまなべる！
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61
列データや行データを追加する
特定の「列データ」を取り出して、別のデータフレームに追加することができます。
データの入ったデータフレーム（
dfA）と、空のデータフレーム（dfB）を作り、「dfAから
国語の列データを取り出して、
dfBに追加」してみましょう。「国語の列だけのデータフレー
ム」が作れます（リスト
2.20）。
06
LESSON
データの追加や削除を行って、加工しましょう。
データのどこを使う？
データが正しく入っているのがわかったら、次は「 そのデータのどこを
使うか」を 確認しよう。
データのどこを使うってどういう意味？
データというのは、客観的な数値の集まりだけど、データ分析をするの
は「 私の問題を解決したい」からだよね。だから、客観的なデータの中
か ら「 私の問題解決に関係する部分はどこか」を考える必要がある。
このとき、必要なデータだけを取り出してまとめたり、いらないデータ
を削除したりしておくなんてこともできる。うっかり関係ないデータ
を見ていたという間違いも起こりにくくなるしね。
そっか。問題解決に関係ない部分をいくら必死に見てても解決しない
もんね。
Chapter
2
62
データフレーム = pd.DataFrame()
データフレーム["新列名"] = 列データ
import pandas ...
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