bridog 发表于 2010-7-4 09:50 
I want to get the estimator of parameter a.
Thank you.
if the model is d=p**a + error , a是我所要求的参数,
Then it is a non-linear regression model. Upon observing d and p we can estimate a. But you said that "d 也是未知的", then there is no way to estimate a.