Fig. 1 Weekly-hourly2 crime frequencies (Sunday to Saturday) four each of four crime types (a d).
And concentration varies depending on whether one is examining all places, regardless of crime experience (prevalence), or only those places with one or more crimes (frequency).
Males are more likely to offend, and those who do offend tend to commit crime with greater frequency than female offenders (D'Unger et al. 2002).
We examine concentration in two conditions: when all places are studied (prevalence), and when only places with at least one crime are studied (frequency).
Levine (1999) advises that higher frequency crimes (e.g. assault, robbery, auto theft) usually have a much lower threshold distance when compared to lower frequency crimes (e.g. murder, rape, arson) which contain higher threshold distances.
He cites the "across the board" studies that consistently prove immigrants commit crimes with less frequency than American citizens and contribute greatly to the American economy. .
Mark Warr, a criminologist and sociology professor at the University of Texas at Austin, made a similar point, telling the AP that the frequency of crime does not warrant the level of fear associated with it.
The prevalence distribution shows more crime concentration than the frequency distribution.
A test was required to determine whether the frequency of crime varied non-randomly over time.
Figure 4 Standardised residual values for estimation methods showing that the start, mid-point and end methods significantly overestimate the frequency of crime at certain times of day.
