Re:Life Expectancy Charts?
- From: Bob Carroll <bob@xxxxxxxxxxxxx>
- Date: Sun, 2 May 2010 13:52:09 -0700 (PDT)
I know there are Life Expectancy charts out there, I just can't seem
to find them.
What was the life expectancy at birth for a person born in the US in
1845, 1861, 1880, or 1875?
What was the life expectancy at birth for a citizen of India born in
India in 1906, 1908, and 1890? (I'm uninterested in British living
in India as part of the army or the govt.)
I /know/ the longevity of those persons, I just need the correlation
And, please -- let me stipulate that roughly 50% of the population
outlives its life expectancy -- and roughly half doesn't-- , which
is why longevity and life expectancy are different numbers. The /
point/ is, if life expectancy was X, then both the man who died at
X+10 and the woman who waved farewell to 3X both beat the odds, but
she did a lot better than he did
Life expectancy at birth is widely misunderstood and misused
statistic.. Calculation is complex, but it is basically the average
(mean) age at death of theoretical group based on their dying at the
death rates by age at that year.
It is the "arithmetic mean", not "median", so 50% do not "live" above
and below it.
As an absurd, but illustrative example, take a population where the
infant death rate (age <1) is 25%, and everyone else lives to 97.
The life exp at birth is 25 years. [97 + 1 +1+1 = 100. 100/4 = 25. ]
The median (50%) is 1.
Life exp at age 2 is 97.
[Please note that actual calculation is much more complex].
India had a very high infant mortality, which greatly lowers their
expectancy at birth. The figure for 1906 has no relevancy for someone
born there and alive as an adult.
In the US not very long ago, the non-white exp at birth was lower than
white. Exp at age 65, non-whites was higher than for whites. The same
might be true for age 65 in US vs India. (One proposed reason is
reverence for old age, and an exaggerated age at death on death
certificates from mis-stated year of birth].
Life insurance companies use actuarial tables based on expectancy at
the insured's age.
Bob [retired professor-- (biostatistics]
Bob & Dee Carroll. Westport, NY, on Lake Champlain
Bob Carroll <bob@xxxxxxxxxxxxx>
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