Sanit checking of weighted results

[Robinlovelace]

There are some statistical sanity checks in #7 but I've just done some more sanity checks and the results are good. Summary of them below. Three schools in one zone:

With weights, how many trips have destinations at each?

Strong near-linear positive relationship between n_trips and weight:

[Robinlovelace]

Without weights there is no correlation. Weights work!

[dabreegster]

Awesome, thanks! I wonder if we could check in your tests to prevent future regressions? If it's not a self contained r script, no worries

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[Robinlovelace]

I could do that but would take some time. Reopening to track progress, note: I may be able to get it to general principle stage and can provide more example input data if that would be useful?

[dabreegster]

Not a priority at all. I should really find better techniques for unit testing in Rust; I'll think about doing that without depending on so many test data files checked in