l******o
发帖数: 162 | 1 Ran a regression to test the relation between Z and A (after control some
other variables); Z is dependent variable,and A is indep.;
A coefficient is positive and significant;
Then ran another regression to test the relation between Z and B (after
control some other variables); still Z is dep. and A is indep.
B coefficient is negative and significant.
==========================================
Based on the above results, can we safely conclude the relatinship between A
and B??? If we can, the re | F****r
发帖数: 345 | 2 My understanding is you need to run a regression of A on B to find the
relationship between A and B.
Think about this: the stock price of Microsoft (A) probably will affect
market index (Z); the stock price of Coca-Cola (B) will also affect market
index (Z). Yet the stock price of Microsoft and Coca-Cola are unlikely
correlated.
Or think it this way: you may decompose Z into two parts, Z1 and Z2. Z1 is
correlated with A; Z2 is correlated with B. If Z1 and Z2 have no overlap (in
information), A a
【在 l******o 的大作中提到】
: Ran a regression to test the relation between Z and A (after control some
: other variables); Z is dependent variable,and A is indep.;
: A coefficient is positive and significant;
: Then ran another regression to test the relation between Z and B (after
: control some other variables); still Z is dep. and A is indep.
: B coefficient is negative and significant.
: ==========================================
: Based on the above results, can we safely conclude the relatinship between A
: and B??? If we can, the re
| s*****a
发帖数: 353 | 3 AB之间可正可负可无关
回到回归的几何表示，A和Z夹角小于90，ZB夹角大于90，这两个对AB之间夹角多少完全
没有提示作用。
A
or
【在 l******o 的大作中提到】
: Ran a regression to test the relation between Z and A (after control some
: other variables); Z is dependent variable,and A is indep.;
: A coefficient is positive and significant;
: Then ran another regression to test the relation between Z and B (after
: control some other variables); still Z is dep. and A is indep.
: B coefficient is negative and significant.
: ==========================================
: Based on the above results, can we safely conclude the relatinship between A
: and B??? If we can, the re
| p*****i
发帖数: 2019 | 4 A之间B完全没法确定
你的体重跟你身高成正比
体重和你收入成正比
收入跟身高？不能确定，要重新检验过 | f***5
发帖数: 1569 | 5 Tai NB le. Make it very clearly
【在 s*****a 的大作中提到】
: AB之间可正可负可无关
: 回到回归的几何表示，A和Z夹角小于90，ZB夹角大于90，这两个对AB之间夹角多少完全
: 没有提示作用。
:
: A
: or
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