You are interested in studying the frequency of falls leading to hospitalization among an elderly population attending your outpatient clinic.  You identify 862 eligible patients over a 4 year period, of whom 223 were followed for 4 years, 354 for 3 years, 112 for 2 years, and 173 for 1 year.  During the 4 year period, there were 98 falls requiring hospitalization.  What is the incidence density rate of falls leading to hospitalization per 1,000 person-years in this population? (Please give your answer rounded to the nearest integer).

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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.