A panel data regression model with heteroskedastic as well as spatially correlated disturbancesis considered, and a joint LM test for homoskedasticity and no spatial correlation is derived. In addition, a conditional LM test for no spatial correlation given heteroskedasticity, as well as a conditional LM test for homoskedasticity given spatial correlation, are also derived. These LM tests are c...

asthma management is a major concern because some asthmatic patients either do not respond or else hardly respond to treatment. therefore in the present study, an attempt has been made to determine the predictors of treatment response in asthmatic patients. thirty six asthmatic adults including 13 male and 23 female were studied dur¬ing a 3 month treatment period. asthma symptom score (ss) and ...

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BACKGROUND Cross-sectional research has demonstrated poorer function and health-related quality of life (HRQOL) in those with multiple sclerosis (MS) but less is known about change over time. The goals of this study were to measure change in HRQOL and identify factors associated with change. METHODS HRQOL was assessed at baseline and annually over two subsequent years using the Multiple Scler...

) Regression-based heteroskedasticity and serial correlation robust standard errors and specification tests are proposed for linear models that may not represent an expectation conditional on all past information. The statistics are computable via a sequence of linear regressions, and the procedures apply to models estimated by ordinary least squares or two stage least squares. Examples of the ...