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I was trying to learn cohort component method for population projection from this link of the webpage of Measure Evaluation. To project the population forward using cohort component method, when the age groups are in 5-year intervals, we need 5-year survival probabilities (please see Table 8.1 of the above link).

Now, I can find out 5-year survival probabilities from the life table of my country. But how can I get something like the first entry of Column 4 of Table 8.1 (which is 0.9809) from a life table? As far I understand this quantity is the probability of surviving of newborns during the 5 year projection period.

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This is calculated is as follows: (1L0 + 4L1)/(5*100,000).

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