Brand choice and logit models - Chi-square
7 important questions on Brand choice and logit models - Chi-square
What are cross-tabs and to which variables are they applicable?
- The collection of the frequencies with which the ith level of the row variable occurs in a sample with the jth level of the column variable.
- Suited to categorical variables or ordinal variables or categorized versions of continuous variables.
How do you denote the sums of rows, columns and total?
- Row sums: ni+
- Column sums: n+j
- Total sum: n++
What is the probability that a customer is in cell (i,j)?
- pij=pi+*p+j
- pi+=ni+/n++
- p+j=n+j/n++
- pij=(ni+/n++)(n+j/n++)
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What is the X2 fit statistic?
With df=(I-1)(J-1).
What are residuals and standardized residuals?
Standardized residuals are (oij - eij)/sqr(eij). Is significant if it exceeds 1.96, meaning no independence.
- High positive standardized residuals mean likely to buy again.
- High negative standardized residuals mean unlikely to buy again.
How do you make the eij formula linear?
- ln(eij) = ln(ni+) + ln(n+j) - ln(n++)
What are log linear models used for?
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