...Therefore, those who perform regression analysis and those who use the results must first examine the quality of the data and verify the validity of the fitted regression equation (this is sometimes called regression diagnosis). Data quality is examined for the presence or absence of outliers and collinearity. Data that is isolated and far removed from the range of variation of the majority of data is called an outlier, and it can be detected by examining the distribution of residuals as well as the distribution of each variable and scatter plot. ... From [Projective Geometry]… Saying that point A is on line l is the same as saying that line l passes through point A, and in this case we say that point A is connected to line l . Connectivity is a projective property, and therefore the property that several points are connected to a line (collinearity) and the property that several lines are connected to a point (concentricity) are projective properties. And theorems that deal only with these properties, such as the following Desargues theorem, are theorems of projective geometry. … *Some of the terminology explanations that mention "collinearity" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…そこで,回帰分析を行う人も,その結果を利用する人も,まず,データの質を検討し,あてはめられた回帰式の妥当性を検証することが必要である(そうすることを回帰診断ということもある)。データの質としては,外れ値の有無と共線性を検討する。大部分のデータの変動の範囲に比べて孤立して飛び離れた位置にあるデータを外れ値といい,それは各変数の分布や散布図を見るほかに残差の分布を調べることによって検出される。… 【射影幾何学】より… 点Aが直線l上にあるということと,直線lが点Aを通るということとは同内容であるが,このことを点Aは直線lと結合しているという。結合性は射影的性質で,したがっていくつかの点が1直線と結合しているという性質(共線性)や,いくつかの直線が1点と結合しているという性質(共点性)は射影的性質である。そして,これらの性質のみを扱った定理,例えば次のデザルグの定理は射影幾何学の定理である。… ※「共線性」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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