SHAZAM Community
Ask Your Question

Logistic regression and modal value.

asked 2012-01-06 06:28:58 +0000

Pantera gravatar image

Hello users of Shazam,

I use the logit-estimator (logistic regeression). Alle my variables (dependent & independent) are dichotomous. Shazam calculates the marginal probabilities of the variables. The notion "typical case" is important when the marginal probabilities are calculated. According to the Shazam manual - see last version, p. 313:

"An approach is to set values to represent a "typical" case. A "typical case" can be defined by setting all dummy variables to their modal values and all other variables to their mean values".

Question: What is meant by "modal value"? Is it the most frequent value of the random dummy variable?

edit retag flag offensive close merge delete


Ken - thanks for your confirmation. I have two follow up questions to this topic: Let's say we have a sample of N observations and that the dummy variable has the value 1 in 50% of the cases and value 0 in the rest (50%) of the sample. (a) In this case It is not possible to conclude what is the modal value - the most frequent value of the dummy variable? (b) Why not use the average value of the dummy variable? In this particular case the average value would have been 0.5?

Pantera gravatar imagePantera ( 2012-01-09 05:43:45 +0000 )edit

2 answers

Sort by ยป oldest newest most voted

answered 2012-01-09 17:52:50 +0000

ken gravatar image

In this case there is no 'typical case' you have two possibilities so just do it twice to show the two typical cases. Dummy variables should always be 0 or 1 not .5

edit flag offensive delete link more


Thanks Ken!

Pantera gravatar imagePantera ( 2012-01-10 07:53:26 +0000 )edit

answered 2012-01-08 15:29:01 +0000

ken gravatar image

Yes, modal is the most frequent value

edit flag offensive delete link more
Login/Signup to Answer

Question Tools


Asked: 2012-01-06 06:28:58 +0000

Seen: 51,030 times

Last updated: Jan 09 '12