Given a surface over the grid of jtsurf() and the offender's known
base: the surface's value in the base's cell, the hit score (the share
of the grid searched, in decreasing order of the surface, up to and
including the base's cell), in the best and the worst order of ties
(Rossmo 2000; Canter et al. 2000), and the error distance from the peak
cell's centre to the base.
Arguments
- prob
The surface: a matrix of values from 0, nx rows by ny
columns, as jtsurf() returns.
- win
The grid's rectangle, as given to jtsurf().
- base
The known base, c(x, y), inside win.
Value
A named numeric vector: p (the value in the base's cell),
hitbest and hitworst (shares from 0 to 1), err (the error
distance), peak and cell (the peak's and the base's cell, numbered
down the columns).
References
Rossmo, D. K. (2000). Geographic Profiling. CRC Press.
Examples
s <- jtsurf(c(2, 3, 4), c(2, 4, 3), win = c(0, 6, 0, 6), nx = 30,
ny = 30, type = "negexp", par = c(1, 1), mode = "lik")
jtacc(s$prob, win = c(0, 6, 0, 6), base = c(3.2, 2.9))
#> p hitbest hitworst err peak cell
#> 0.00932350 0.01000000 0.01111111 0.22360680 467.00000000 437.00000000
