incapr
Incapacitation under desistance and replacement
incapr(lam, t0, s, r = 0)crimlab.incapr(lam, t0, s, r=None)crimlab incapr --lam VALUE --t0 VALUE --s VALUE [--r VALUE]Crimes prevented by a sentence of s periods served from career age
t0, when the offending rate falls with career age and a share r of
the crimes prevented is committed by someone else instead. The count is
at most s times the rate at the start of the sentence and at least s
times the rate at its end; the same sentence served one period later
prevents no more; and, net of replacement, the estimate from the rate at
the start is still an upper bound. The usual constant-rate estimate
therefore overstates what a sentence buys under both assumptions. See
proof("incapr").
Parameters
Section titled “Parameters”lamOffending rates by career age,
lam[1]at age 0: non-negative numbers that never increase.t0The career age at which the sentence starts: a whole number from 0, with
t0 + sat mostlength(lam) - 1.sThe sentence in periods: a whole number from 1.
rThe replacement share: one number from 0 to 1.
Returns
Section titled “Returns”A named numeric vector: prev (crimes prevented), net (net of
replacement), upper (s * lam at age t0), lower (s * lam at age
t0 + s) and later (crimes prevented by the same sentence from age
t0 + 1).
References
Section titled “References”Shinnar, S. and Shinnar, R. (1975). The effects of the criminal justice system on the control of crime: a quantitative approach. Law and Society Review, 9(4), 581-611. doi:10.2307/3053340
Examples
Section titled “Examples”incapr(lam = c(12, 10, 8, 6, 5, 4, 3, 2, 2, 1), t0 = 2, s = 3, r = 0.25)Generated from the R help page: incapr in the R reference.