is there a significant difference between coefficients

[stoeber]

Hi all,

I got maybe a silly question but for my research i nee dto have an answer and can't find it.

I got different models (tobit regressions)

Y category 1: xA bB
Y category 2: xA bB
Y category 3: xA bB
Y category 4: xA bB

Now i want to check whether the coefficient x is different in model 1 and 4, and 1 and 3 and 1 and 2, etc. i got the standard errors and all, but cause of not one model i can't do just a diffence test right?

The data:
Model 1 Model 2 Model 3 Model 4
A -0,0509 (0,0038) 0,000 -0,0560 (0,0045) 0,000 -0,1252 (0,0111) 0,000 -0,1485 (0,0143) 0,000
B 0,0267 (0,0029) 0,000 0,0239 (0,0034) 0,000 0,0344 (0,0056) 0,000 0,0415 (0,0049) 0,000


Thanks in advance