Entries by Essy

Compare the baseline risk (where E = 0) of Subject 1 and Subject 2. Is there a difference (i.e., heterogeneity) in the baseline risk between subjects? Note that for a model containing subject-specific random effects, the variance of the random intercept is a measure of baseline risk heterogeneity.

November 28, 2021 in /by

Compare the baseline risk (where E = 0) of Subject 1 and Subject 2. Is there a difference (i.e.,… Compare the baseline risk (where E = 0) of Subject 1 and Subject 2. Is there a difference (i.e., heterogeneity) in the baseline risk between subjects? Note that for a model containing subject-specific random effects, the […]

Calculate the odds ratio for Subject 1 and Subject 2 separately. Calculate the odds ratio after pooling the data for both subjects. How do the odds ratios compare? Note: The subject-specific odds ratio as calculated here is a conceptualization of a subject-specific effect, while the pooled odds ratio is a conceptualization of a population-averaged effect.

November 28, 2021 in /by

Calculate the odds ratio for Subject 1 and Subject 2 separately. Calculate the odds ratio after… Calculate the odds ratio for Subject 1 and Subject 2 separately. Calculate the odds ratio after pooling the data for both subjects. How do the odds ratios compare? Note: The subject-specific odds ratio as calculated here is a conceptualization […]

what are the dimensions of the G matrix and of the R matrix? The next set of s is designed to illustrate how an individual level odds ratio can differ from a population averaged (marginal) odds ratio

November 28, 2021 in /by

Consider a study in which there are five responses per subject. If a model contains two… Consider a study in which there are five responses per subject. If a model contains two subject-specific random effects (for the intercept and slope), then for subject i, what are the dimensions of the G matrix and of the […]

What is the corresponding odds ratio if the B and C cells are equal to 0? Did both the B and C cells have to equal 0 to obtain this corresponding odds ratio? Also show that if both the A and D cells are equal to zero, then the correlation is equal to 1. What is that corresponding odds ratio?

November 28, 2021 in /by

Show that if both the B and C cells are equal to 0, then the correlation between Y j and Y k is… Show that if both the B and C cells are equal to 0, then the correlation between Yj and Yk is equal to 1 (assuming A and D are nonzero). What is […]

Show that if both the B and C cells are equal to 0, then the correlation between Yj and Yk is equal to 1 (assuming A and D are nonzero). What is the corresponding odds ratio if the B and C cells are equal to 0? Did both the B and C cells have to equal 0 to obtain this corresponding odds ratio? Also show that if both the A and D cells are equal to zero, then the correlation is equal to 1. What is that corresponding odds ratio?

November 28, 2021 in /by

Show that if both the B and C cells are equal to 0, then the correlation between Y j and Y k is… Show that if both the B and C cells are equal to 0, then the correlation between Yj and Yk is equal to 1 (assuming A and D are nonzero). What is […]

Calculate and compare the respective odds ratios and correlations between Yj and Yk for the data summarized in Tables 1 and 2 to show that the same odds ratio can correspond to different correlations.

November 28, 2021 in /by

Calculate and compare the respective odds ratios and correlations between Y j and Y k for the data.. Calculate and compare the respective odds ratios and correlations between Yj and Yk for the data summarized in Tables 1 and 2 to show that the same odds ratio can correspond to different correlations.

Estimate the odds ratio for RX using Model 2 and Model 3. Is there a suggestion that SEQUENCE is confounding the association between RX and heartburn relief. Answer this question from a data-based perspective (i.e., comparing the odds ratios) and a theoretical perspective (i.e., what it means to be a confounder).

November 28, 2021 in /by

Estimate the odds ratio for RX using Model 2 and Model 3. Is there a suggestion that SEQUENCE is… Estimate the odds ratio for RX using Model 2 and Model 3. Is there a suggestion that SEQUENCE is confounding the association between RX and heartburn relief. Answer this question from a data-based perspective (i.e., comparing […]

For the Infant Care data, how many more correlation parameters would be included in a model that uses an unstructured correlation structure rather than a stationary 8-dependent correlation structure?

November 28, 2021 in /by

Compare the underlying assumptions of the stationary 8-dependent correlation structure with the… Compare the underlying assumptions of the stationary 8-dependent correlation structure with the unstructured correlation structure as it pertains to this model. For the Infant Care data, how many more correlation parameters would be included in a model that uses an unstructured correlation structure […]

The following output should be used for s 5–10 and contains the results from running the same GEE model on the Infant Care data as in the previous questions, except that in this case, a stationary 8-dependent correlation structure is specified. The working correlation matrix for this model is included in the output.

November 28, 2021 in /by

The following output should be used for s 5–10 and contains the results from running the same GEE… The following output should be used for s 5–10 and contains the results from running the same GEE model on the Infant Care data as in the previous questions, except that in this case, a stationary 8-dependent […]