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Ch 13 question number 13.9 part (iv)

Discussion in 'CS1' started by SURESH SHARMA, Mar 25, 2020.

  1. SURESH SHARMA

    SURESH SHARMA Ton up Member

    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
     
  2. John Lee

    John Lee ActEd Tutor Staff Member

    Model 2 has 5 parameters.
     
  3. SURESH SHARMA

    SURESH SHARMA Ton up Member

    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
     
  4. John Lee

    John Lee ActEd Tutor Staff Member

    Since the null model (1) has 1 parameter we can see that the original dof before we estimated parameters was 8.
    We then subtract the number of parameters from 8 to get the dof for each model.

    Null model (1 parameter) dof = 8 - 1 = 7
    Model 1 (4 parameters) dof = 8 - 4 = 4
    Model 2 (5 parameters) dof = 8 - 5 = 3
    Model 3 (8 parameters) dof = 8 - 8 = 0
     

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