问题如下图：
选项：
A. 
B. 
C. 
D. 
解释：
请问omitted variable 为什么和included regressor是correlated的啊？
NO.PZ2018122801000072 问题如下 The proper selection of factors to inclu in ornary least squares estimation is criticto the accuraof the result. When es omittevariable bias occur? Omitted variable bioccurs when the omittevariable is correlatewith the includ regressor anis a terminant of the pennt variable. Omitted variable bioccurs when the omittevariable is correlatewith the includ regressor but is not a terminant of the pennt variable. Omitted variable bioccurs when the omittevariable is inpennt of the includ regressor anis a terminant of the pennt variable. Omitted variable bioccurs when the omittevariable is inpennt of the includ regressor but is not a terminant of the pennt variable. A is correct. 考点 ： Omit Variable 解析 ： Omittevariable bioccurs when a mol improperly omits one or more variables thare criticterminants of the pennt variable anare correlatewith one or more of the other incluinpennt variables. Omittevariable biresults in over-or unr-estimation of the regression parameters. 这道题我错选了C，因为不太理解“omittevariable is correlatewith the incluregressor”，我选的是inpennt。
NO.PZ2018122801000072 问题如下 The proper selection of factors to inclu in ornary least squares estimation is criticto the accuraof the result. When es omittevariable bias occur? Omitted variable bioccurs when the omittevariable is correlatewith the includ regressor anis a terminant of the pennt variable. Omitted variable bioccurs when the omittevariable is correlatewith the includ regressor but is not a terminant of the pennt variable. Omitted variable bioccurs when the omittevariable is inpennt of the includ regressor anis a terminant of the pennt variable. Omitted variable bioccurs when the omittevariable is inpennt of the includ regressor but is not a terminant of the pennt variable. A is correct. 考点 ： Omit Variable 解析 ： Omittevariable bioccurs when a mol improperly omits one or more variables thare criticterminants of the pennt variable anare correlatewith one or more of the other incluinpennt variables. Omittevariable biresults in over-or unr-estimation of the regression parameters. Omittevariable biresults in over-or unr-estimation of the regression parameters.什么时候unr什么时候over？
NO.PZ2018122801000072 Omittevariable bioccurs when the omittevariable is correlatewith the incluregressor but is not a terminant of the pennt variable. Omittevariable bioccurs when the omittevariable is inpennt of the incluregressor anis a terminant of the pennt variable. Omittevariable bioccurs when the omittevariable is inpennt of the incluregressor but is not a terminant of the pennt variable. A is correct. 考点 Omit Variable 解析 Omittevariable bioccurs when a mol improperly omits one or more variables thare criticterminants of the pennt variable anare correlatewith one or more of the other incluinpennt variables. Omittevariable biresults in over-or unr-estimation of the regression parameters. 请问terminant在讲义上怎么体现的 老师有讲过吗
问一道题：NO.PZ2018122801000072
Omittevariable bioccurs when the omittevariable is correlatewith the incluregressor but is not a terminant of the pennt variable. Omittevariable bioccurs when the omittevariable is inpennt of the incluregressor anis a terminant of the pennt variable. Omittevariable bioccurs when the omittevariable is inpennt of the incluregressor but is not a terminant of the pennt variable. A is correct. 考点 Omit Variable 解析 Omittevariable bioccurs when a mol improperly omits one or more variables thare criticterminants of the pennt variable anare correlatewith one or more of the other incluinpennt variables. Omittevariable biresults in over-or unr-estimation of the regression parameters. Omittevariable 会unrestimate 是在与inpennt variable 负相关的情况下吗？
