A study is conducted in patients with HIV. The primary outcome is CD4 cell count which is a measure of the stage of the disease. Lower CD4 counts are associated with more advanced disease. The investigators are interested in the association between vitamin and mineral supplements and CD4 count. A multiple regression analysis is performed relating CD4 count to use of supplements (coded as 1=yes, 0=no) and to duration of HIV, in years (i.e., the number of years between the diagnosis of HIV and the study date). For the analysis, Y=CD4 count. = 501.41 + 12.67 Supplements – 30.23 Duration of HIV What is the expected CD4 count for a patient taking supplements who has had HIV for 2.5 years? = ________ What is the expected CD4 count for a patient not taking supplements who was diagnosed with HIV at study enrollment? = ________ What is the expected CD4 count for a patient not taking supplements who has had HIV for 2.5 years. = ________
Correlation
Correlation defines a relationship between two independent variables. It tells the degree to which variables move in relation to each other. When two sets of data are related to each other, there is a correlation between them.
Linear Correlation
A correlation is used to determine the relationships between numerical and categorical variables. In other words, it is an indicator of how things are connected to one another. The correlation analysis is the study of how variables are related.
Regression Analysis
Regression analysis is a statistical method in which it estimates the relationship between a dependent variable and one or more independent variable. In simple terms dependent variable is called as outcome variable and independent variable is called as predictors. Regression analysis is one of the methods to find the trends in data. The independent variable used in Regression analysis is named Predictor variable. It offers data of an associated dependent variable regarding a particular outcome.
A study is conducted in patients with HIV. The primary outcome is CD4 cell count which is a measure of the stage of the disease. Lower CD4 counts are associated with more advanced disease. The investigators are interested in the association between vitamin and mineral supplements and CD4 count. A multiple regression analysis is performed relating CD4 count to use of supplements (coded as 1=yes, 0=no) and to duration of HIV, in years (i.e., the number of years between the diagnosis of HIV and the study date). For the analysis, Y=CD4 count.
= 501.41 + 12.67 Supplements – 30.23 Duration of HIV
- What is the expected CD4 count for a patient taking supplements who has had HIV for 2.5 years?
= ________
- What is the expected CD4 count for a patient not taking supplements who was diagnosed with HIV at study enrollment?
= ________
- What is the expected CD4 count for a patient not taking supplements who has had HIV for 2.5 years.
= ________
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