Frequency of Cases of CHD Rate per 10,000 Population Person Years of Risk Ratio Exercise Follow-up No Exercise 32,843 23 7.0 Reference Once per Week 117,205 40 3.49 0.49 Twice per Week 25,111 4 1.59 0.23

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.