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Two simple regression models were used to predict a single dependent variable. Both models were highly significant, but when the two independent variables were placed in the same multiple regression model for the dependent variable, R² did not increase substantially and the parameter estimates for the model were not significantly different from 0. This is probably an example of collinearity.
Incidence
The occurrence, rate, or frequency of a disease, crime, or something undesirable within a specified population or area.
Prevalence
The proportion of individuals in a population who have a particular disease or condition at a specific time.
Risk Factors
Elements or conditions that increase the likelihood of developing a disease or injury, including genetic, environmental, and lifestyle factors.
Scientific Method
A systematic and logical approach to discovering how things in the universe work, involving observation, experimentation, and data analysis.
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