Note that the NCVS requires that the victims survive, and does not collect data on crimes like murder, which may cause systematic differences.
Right. I'm comparing particular categories of crime-- reports from robbery victims to arrests for robbery, reports of rape to arrests for rape etc. I'm definitely not comparing total arrests for violent crimes to reports of violent crimes minus homicide.
This thread is for discussing anything that doesn't seem to deserve its own post.
If the resulting discussion becomes impractical to continue here, it means the topic is a promising candidate for its own thread.