Exam 21: Multilevel Linear Models

What effect does 'centering' have on the data in the following experiment In their study of 'Using individual growth model to analyse the change in quality of life from adolescence to adulthood' (2006), Chen and Cohen conducted interviews on 3 different occasions over a period of time and the following graph demonstrates the physical health changes noted over these 3 periods in 20 of their sample. Individual Physical Health Change (raw data, n = 20) Chen and Cohen Health and Quality of Life Outcomes 2006 4:10 doi:10.1186/1477-7525-4-10

Which of the following is not an example of the benefits of multilevel models?

In their study of 'Using individual growth model to analyse the change in quality of life from adolescence to adulthood', Chen and Cohen (2006) conducted interviews on three different occasions over a period of time, and the following graph demonstrates the physical health changes noted over these three periods in 20 of their sample. Individual Physical Health Change (raw data, n = 20) What does the graph illustrate?

In a study of the analysis of large hierarchical data with multilevel logistic modelling using PROC Glimmix, Li et al. determine the following results in their first approach to the analysis when considering factors associated with death from injury and exposure, gender, race or age What would you consider to be the findings of this result?

Which of the following was not a good predictor of physical health in this example? In their study of 'Using individual growth model to analyse the change in quality of life from adolescence to adulthood' (2006), Chen and Cohen conducted interviews on 3 different occasions over a period of time and the following graph demonstrates the physical health changes noted over these 3 periods in 20 of their sample. Individual Physical Health Change (raw data, n = 20) Chen and Cohen Health and Quality of Life Outcomes 2006 4:10 doi:10.1186/1477-7525-4-10 The following results are obtained from fitting the unconditional linear growth model. Table 1

In a study of the Analysis of Large Hierarchical Data with Multilevel Logistic modelling using PROC Glimmix, Li et al determine the following results in their first approach to the analysis when considering factors associated with death from injury and exposure, gender, race or age In their second round of analysis, a range of data outputs were achieved including the following table What do the data represent?

What does the Estimates of Covariance Parameters table tell you about the data?

At age 23, what was the average physical health score of the young adults?

In their study of 'Using individual growth model to analyse the change in quality of life from adolescence to adulthood' (2006), Chen and Cohen conducted interviews on 3 different occasions over a period of time and the following graph demonstrates the physical health changes noted over these 3 periods in 20 of their sample. Individual Physical Health Change (raw data, n = 20) Chen and Cohen Health and Quality of Life Outcomes 2006 4:10 doi:10.1186/1477-7525-4-10 With reference to the graph, what can be deduced about the majority of those sampled?