S*****z
发帖数: 109 | 1 请教：
logistic regression,
1) if the coefficient of age is positive/ age square is negative, the age
effect is invert U shape.
2) the coefficient of age is negative/age squared is positive, the age
effect is U shape.
But, 如果age和age squared 都是正的或者都是负的呢，age effect是exponential
increasing/decreasing?
大家在做economics/statistics model时会Keep都正或者都负的情形吗？理论上make
sense吗？ | D*****a
发帖数: 2847 | 2 y=x^2 or - x^2
x positive
so?
【在 S*****z 的大作中提到】
: 请教：
: logistic regression,
: 1) if the coefficient of age is positive/ age square is negative, the age
: effect is invert U shape.
: 2) the coefficient of age is negative/age squared is positive, the age
: effect is U shape.
: But, 如果age和age squared 都是正的或者都是负的呢，age effect是exponential
: increasing/decreasing?
: 大家在做economics/statistics model时会Keep都正或者都负的情形吗？理论上make
: sense吗？
| f***5
发帖数: 1569 | 3 1. You are correct.
2. It makes sense as long as u can explain it. |
|
