estimateDistFun {Chicago} | R Documentation |
Estimates the function that models how the expected number of counts decreases with increasing distance.
estimateDistFun(cd, method = "cubic", plot = TRUE, outfile = NULL)
cd |
A |
method |
Choice of method: "cubic" is currently the only allowed option, which fits a cubic function with linear extrapolation, on a log-log scale. |
plot |
Output a diagnostic plot. |
outfile |
If |
By default, we look in 75 distance bins, and a cubic fit is used. For distances that lie outside of the bin boundaries, it is assumed that the function is log-linear, with continuity of f
and its first derivative on the log-scale.
An object of class chicagoData
, with the parameters of the distance function present as params(cd)$distFunParams.
Mikhail Spivakov, Jonathan Cairns, Paula Freire Pritchett
data(cdUnitTest) estimateDistFun(cdUnitTest)