Question 1

In a study of 'communicating the significance of radiologic test results' by Black and Armstrong (1986), the use of likelihood ratios is very important to the work of the radiologist Why?
A) Because it provides a reliable predictor of disease probability.
B) Because it assists with computation of the result.
C) Because it has a low predictive power.
D) None of the above.

Accepted Answer

Likelihood ratios provide a reliable predictor of disease probability, which is important for radiologists in communicating the significance of radiologic test results.

Question 2

Which of the following is not an assumption of loglinear analysis?
A) An entity should fall into only one cell of the contingency table.
B) Expected frequencies should be large enough for a reliable analysis.
C) If there are two variables 20% of cells must have frequencies less than 1.
D) Collapsed data need to have a non-significant highest-order interaction.

Accepted Answer

This statement is not an assumption of loglinear analysis. In fact, having 20% of cells with frequencies less than 1 may indicate that the data violate the assumption of independence and may require alternative analyses such as exact tests. The other statements are assumptions of loglinear analysis.

Question 3

When would you consider using a loglinear analysis as the method of choice?
A) When data need to be collapsed
B) When sample sizes are large
C) When there are several categorical variables
D) None of the above

Accepted Answer

Loglinear analysis is a statistical technique that is used for analyzing the relationships among three or more categorical variables. Therefore, it is the method of choice when there are several categorical variables. It is commonly used in fields such as sociology, politics, psychology, and epidemiology to study the underlying factors that influence a particular event, behavior, or phenomenon. It is especially useful when analyzing contingency tables that have large numbers of cells, as it can help to identify the significant relationships between variables and eliminate noise or random variation in the data.

Question 4

A study entitled 'Structural equation and log-linear modelling: a comparison of methods in the analysis on caregivers' health' by Zhu et al. (2006) showed a large effect size in the interaction between psychological health and physical health . What can be deduced by this finding?
A) Both factors are significantly related in the study.
B) Both factors are significantly unrelated in the study.
C) Both factors have an effect on the study results.
D) None of the above.

Accepted Answer

The large effect size in the interaction between psychological health and physical health suggests that both factors are significantly related in the study.

Quiz 19: Categorical Outcomes: Chi-Square and Loglinear Analysis

In a study of 'communicating the significance of radiologic test results' by Black and Armstrong (1986) , the use of likelihood ratios is very important to the work of the radiologist Why?

Which of the following is not an assumption of loglinear analysis?

When would you consider using a loglinear analysis as the method of choice?

A study entitled 'Structural equation and log-linear modelling: a comparison of methods in the analysis on caregivers' health' by Zhu et al. (2006) showed a large effect size in the interaction between psychological health and physical health . What can be deduced by this finding?