[Retric]

My point was, you can ask questions like: Which was the peek year for crime? Why did rape not follow that trend? etc etc.

  Downward trend: - 2.2%
  1991 Robbery 687,732 
  1992 Robbery 672,478

  Upward trend: + 2.3%
  1991 Forcible rape 106,593
  1992 Forcible rape 109,062

Edit: By second digit I was talking about % change, (1065 and 1090) = 2.3% change as is 90 and 92.07. Clearly saying 98 to 99 is a change in the second digit where 100 and 109 is a change in the third is missing something.

However, X + 2% vs Y - 2% does not necessarily mean anything. If you want to understand people you need to look beyond any single year to find cause and effect.

PS: A heatwave can significantly change a city's crime rate, but on it's own there is no meaningful long term effect. Average things out over months and years and you can start to see meaning emerge from chaos.

[anamax]

> My point was, you can ask questions like: Which was the peek year for crime? Why did rape not follow that trend?

"What was the peak year for crime" assumes a definition of crime, a way to aggregate rape, murder, etc. While we can agree on one, that agreement isn't binding on others. That's why I didn't claim that there was a peak crime year.

That said, averaging the 60s doesn't make sense as there was too much change.

Demographics alone tell us that different kinds of crime will peak a different times.

> By second digit I was talking about % change,

Since I was talking about to 5.1 to 5.4, the 98/99 comparison isn't especially relevant.

> A heatwave can significantly change a city's crime rate, but on it's own there is no meaningful long term effect.

You're assuming that weather doesn't have trends or long term effects. I'd argue that the dust bowl did. Urban heat-islands cause persistent heatwaves. (Yes, that's artificial climate, but ....)