Ch 13 question number 13.9 part (iv)

Dear team
Please note model 1 has 4 parameter , Model 2 has 4 parameter, and model 3 has 8 . How come degree of freedom is 4 for model 1 , 3 for model 2 and zero for model 3.

Please clarify.

Regards
Suresh sharma

 

yes sir , my mistake model 2 has 5 parameter,

please provide the calculation for degree of freedom , model 1=4, model,2 =3, and model 3 =0.
i understand the degree of freedom for chi square ,\
for model 1 its (7-4=3)
for model 2 (4-3=1)
model 3=(3-0=3)

please clarify model 1 degree of freedom =4
model -2 =3
model 3=0

regrads

suresh sharma