axMidpoint: axMidpoint approximates a(x) using interval midpoints
In MortHump: Measure the Young Adult Mortality Hump

Description Usage Arguments Details Value Author(s) References See Also

approximates a(x) using interval midpoints (except a0, which is estimated using a rule-of-thumb formula scaled by m0)

1	axMidpoint(Mx, n)

`Mx`	a numeric vector of central death rates, defined as deaths/exposure.
`n`	a numeric vector of the age-interval widths. Must be the same length as Mx.

All values will be in the exact middle of the age interval, except for a0, which uses: a0 = .07 + 1.7 * M0.

returns a numeric vector of ax values

Tim Riffe

formula for a0 as suggested by: Keyfitz, N. (1970), Finding probabilities from observed rates, or how to make a life table. The American Statistician (1970), pp. 28-33

See Also axEstimate, a wrapper function for this and 3 other a(x) estimation methods (axKeyfitz,axSchoen and axPreston).

MortHump documentation built on Jan. 24, 2018, 6:02 p.m.