recurring problem I'm encountering re: average bus ridership is the drastic fluctuations you get--it's hard to be sure if there's an error in the data collection, in my processing it, or if ridership really just varies that much; all are plausible explanations
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I'm about 80% sure that the problem isn't in my processing--I'm neurotic enough about it that I usually catch my mistakes, but I've screwed up once or twice in the past, so u never know
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The data collection (automatic passenger counts) is known to have problems with consistency and accuracy but still prob better than trying to estimate from a sample of in-person counts (especially if the variance is really as high as it looks!)
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Replying to @380kmh
I have an ongoing dialogue with one of our transit planners because I'm pretty convinced the APC counts on my route are just plumb wrong.
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Replying to @sandypsj
No kidding! Nothing better than the look on a municipal official's face when I explain that no, the number boarding doesn't match the number alighting, and that's just an apparently insoluble problem with the technology
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Gets 10000x worse when bus drivers forget to turn the damn thing on tho, and you get days or weeks reporting zero riders
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Replying to @380kmh
yeah. Like, they're insisting to me that the 39--busiest bus in Boston--averages a max of 37 riders at most at PM peak. I've been riding it for ~2 months and only twice been on a bus with fewer than 50 people aboard at its busiest.
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Now, maybe I've gotten systematically unlucky with bunching for two months. But what's a better bet, that the APCs are wonky or that a trained observer like me is that far off?
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