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[https://www.erim.eur.nl/centres/necessary-condition-analysis/ Necessary condition analysis] (NCA) may be used when the analyst is trying to determine the extent to which independent variable X allows variable Y (e.g., "To what extent is a certain unemployment rate (X) necessary for a certain inflation rate (Y)?"). Whereas (multiple) regression analysis uses additive logic where each X-variable can produce the outcome and the X's can compensate for each other (they are sufficient but not necessary), necessary condition analysis (NCA) uses necessity logic, where one or more X-variables allow the outcome to exist, but may not produce it (they are necessary but not sufficient). Each single necessary condition must be present and compensation is not possible.
 
[https://www.erim.eur.nl/centres/necessary-condition-analysis/ Necessary condition analysis] (NCA) may be used when the analyst is trying to determine the extent to which independent variable X allows variable Y (e.g., "To what extent is a certain unemployment rate (X) necessary for a certain inflation rate (Y)?"). Whereas (multiple) regression analysis uses additive logic where each X-variable can produce the outcome and the X's can compensate for each other (they are sufficient but not necessary), necessary condition analysis (NCA) uses necessity logic, where one or more X-variables allow the outcome to exist, but may not produce it (they are necessary but not sufficient). Each single necessary condition must be present and compensation is not possible.
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当分析师试图确定自变量 X 在多大程度上允许变量 Y 的出现时,可以使用 https://www.erim.eur.nl/centres/Necessary-condition-analysis/ '''<font color='#ff8000'>必要条件分析Necessary condition analysis(NCA)</font>'''(例如,“某个失业率(X)在多大程度上对某个通货膨胀率(Y)是必要的? ”)。 (多重)回归分析分析使用'''<font color='#ff8000'>加法逻辑additive logic</font>''',其中每个 X 变量可以产生结果,X 之间可以相互补偿(这些X都是充分的,但不是必要的) ,然而必要条件分析使用'''<font color='#ff8000'>必要逻辑necessity logic</font>,其中一个或多个 X 变量允许结果的存在,但也可能不产生这个结果(它们是必要的,但不是充分的)。每个单一的必要条件都必须存在,变量之间不允许补偿。
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当分析师试图确定自变量 X 在多大程度上允许变量 Y 的出现时,可以使用 https://www.erim.eur.nl/centres/Necessary-condition-analysis/ '''<font color='#ff8000'>必要条件分析Necessary condition analysis(NCA)</font>'''(例如,“某个失业率(X)在多大程度上对某个通货膨胀率(Y)是必要的? ”)。 (多重)回归分析分析使用'''<font color='#ff8000'>加法逻辑additive logic</font>''',其中每个 X 变量可以产生结果,X 之间可以相互补偿(这些X都是充分的,但不是必要的) ,然而必要条件分析使用'''<font color='#ff8000'>必要逻辑necessity logic</font>''',其中一个或多个 X 变量允许结果的存在,但也可能不产生这个结果(它们是必要的,但不是充分的)。每个单一的必要条件都必须存在,变量之间不允许补偿。
    
==Analytical activities of data users==
 
==Analytical activities of data users==
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