Civilian casualties, as that is what the subject deals with. (One could also divide by the number of displaced people, or the number of permanently displaced people, but right now, we're dealing with civilian casualties during the war.)

Weighted average. In this case weighted by the number of civilian deaths that went into each individual ratio.

The weighted average is preferable because the lower numbers of necessity have higher uncertainties associated with them - similar to the batting averages in the first example here

For the same reasons, the standard deviations given in the diary are nonsense, and cannot be used to show significance.

- Jake

Friends come and go. Enemies accumulate.