how can I calculate the degrees of freedom in order to check if Chi Square for latent class (CBC) is sig.

In my study I included 6 attributes with 3 level each (in total 18 levels).

Thanks and best,

Judith

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how can I calculate the degrees of freedom in order to check if Chi Square for latent class (CBC) is sig.

In my study I included 6 attributes with 3 level each (in total 18 levels).

Thanks and best,

Judith

0 votes

The number of parameters estimated is as follows for a conjoint study:

If you are using the default (part-worth utility estimation),

Total#_Levels-Total#Attributes

And, if you have a None choice, add 1 to that.

For example, if you have 6 attributes each with 3 levels plus a None, the total number of parameters estimated is:

18-6+1=13

If you are using the default (part-worth utility estimation),

Total#_Levels-Total#Attributes

And, if you have a None choice, add 1 to that.

For example, if you have 6 attributes each with 3 levels plus a None, the total number of parameters estimated is:

18-6+1=13

...

To extend this to the latent class case you would also have to account for the number of segments, multiplying by the number of segments minus one. So with 6 attributes 3 levels each and a none with 4 segments you'd have (18-6+1)*3 = 39 parameters.