How to life expectancy is calculated ?
Life expectancy is a statistical measure of the average time a person is expected to live, based on various factors like age, gender, and location. It is typically calculated using life tables (also known as actuarial tables or mortality tables). Here's how it is calculated step by step: 1. Gather Mortality Data Collect data on the number of people alive at the beginning of each age interval (e.g., 0–1 years, 1–2 years, etc.). Collect data on the number of deaths during each age interval for a specific population. 2. Calculate Age-Specific Mortality Rates For each age interval, calculate the probability of dying, usually denoted as q x q_x q x , where x x x is the age. q x = Number of deaths at age x Number of people alive at age x q_x = \frac{\text{Number of deaths at age } x}{\text{Number of people alive at age } x} q x = Number of people alive at age x Number of deaths a...