Error model formula: a '=a + e,
A is not the real value, the error of a 'is the observed value, e' is error.

Average: E/E '=0, variance V' [E]=deta party

The mean error by their own how to define?
I to j, E [ei 'ej]=deta party
Ortherwise, E [ei 'ej]=0

This is how to define?

CodePudding user response:

https://baike.baidu.com/item/%E6%96%B9%E5%B7%AE/3108412? Fr=Aladdin