How do you calculate odds ratio in logistic regression SPSS?

How do you calculate odds ratio in logistic regression SPSS?

To get the odds ratio, which is the ratio of the two odds that we have just calculated, we get . 472/. 246 = 1.918. As we can see in the output below, this is exactly the odds ratio we obtain from the logistic regression.

What is the difference between odds ratio and chi square?

As Lluis’s mentioned in his answer, you would use a chi-square to TEST if an association exists. On the other hand, you would use an odds ratio, relative risk, hazard rate, etc. to MEASURE or quantify the association between a risk factor/covariate and an outcome.

What does an odds ratio tell you?

The odds ratio tells us how much higher the odds of exposure are among case-patients than among controls. An odds ratio of • 1.0 (or close to 1.0) indicates that the odds of exposure among case-patients are the same as, or similar to, the odds of exposure among controls. The exposure is not associated with the disease.

What is the odds ratio in logistic regression?

For example, in logistic regression the odds ratio represents the constant effect of a predictor X, on the likelihood that one outcome will occur. The key phrase here is constant effect. In regression models, we often want a measure of the unique effect of each X on Y.

What are the dimensions of a crosstab in SPSS?

Contingency table. The dimensions of the crosstab refer to the number of rows and columns in the table. (The “total” row/column are not included.) The table dimensions are reported as as R x C, where R is the number of categories for the row variable, and C is the number of categories for the column variable.

How to calculate odds ratio and relative risk?

This video demonstrates how to calculate odds ratio and relative risk values using the statistical software program SPSS. SPSS can be used to determine odds ratio and relative risk values for various types of data. Loading…

How are the percentages of a row determined in SPSS?

Notice that when computing row percentages, the denominators for cells a, b, c, d are determined by the row sums (here, a + b and c + d ). This implies that the percentages in the “row totals” column must equal 100%.

How are the categories determined in a crosstab?

In a crosstab, the categories of one variable determine the rows of the table, and the categories of the other variable determine the columns. The cells of the table contain the number of times that a particular combination of categories occurred.