Dear All,
I am a newcomer of Stata. I searched for a while in archives list but
there is no related topic to this, so I have a question about my
result:
I employed Weibull model and Log logic model to test my data, but, I
received two different sign in alpha and beta
In Weibull: beta= -.3503182 and alpha=2.669465 (negative in beta)
but in Log logic: beta= .8955857 and alpha= -.4768999 (negative in
alpha)- I expect beta is negative in this model but it did not.
I use the same data set, in which the dependent variable is
(survival) as in attached data set. and independent variable is
(lenght)
I followed the guideline in "maximum likelihood estimation with stata-
3rd edition" to do those tests. So what could I explain for those
results?
Thank for your kindly support,
Best regards,
Ha Pham
id run length hazard survival
1 1 8 0.53 1
2 1 3 0.43 1
3 5 1 0.25 0
4 1 3 1.00 1
5 1 0 0 1
6 2 0 0 0
7 1 0 0 1
8 4 0 0 0
9 4 0 0 0
10 2 0 0 0
11 4 0 0 0
12 1 0 0 1
13 3 0 0 0
14 1 0 0 1
15 2 0 0 0
16 1 0 0 1
