Imagine that exactly 5 years ago, a team of epidemiologists identified a study population of 4,500 men, 65-74 years, in Cedar Rapids, Iowa, to determine the incidence of prostate cancer. Initial tests indicated that 7% of men already had prostate cancer (and therefore not at risk). The remaining men followed prospectively to present time to determine cumulative incidence (CI) of prostate cancer. By the end of the follow-up, 156 men had developed prostate cancer. What was 5-yr CI?
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.
- Imagine that exactly 5 years ago, a team of epidemiologists identified a study population of 4,500 men, 65-74 years, in Cedar Rapids, Iowa, to determine the incidence of prostate cancer. Initial tests indicated that 7% of men already had prostate cancer (and therefore not at risk). The remaining men followed prospectively to present time to determine cumulative incidence (CI) of prostate cancer. By the end of the follow-up, 156 men had developed prostate cancer. What was 5-yr CI?
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