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David Foster's avatar

Cellphone location data, as I understand it, derives from GPS data if the phone has GPS enabled, otherwise, based on triangulation of distances from multiple cell towers. The first should usually be accurate to around 20-30 feet, for the second, more like 500-1000 feet.

I don't know whether the purchased data includes a 'how derived' flag, indicating what records are GPS-derived versus which are not. Would seem important to know.

I haven't done the statistical analysis (and neither, I suspect, have the various professors who claim in 'fact checks' that you can't draw any conclusions from the cellphone data), but adjacency to TEN drop boxes as well as FIVE political nonprofits seems like a pretty tight screen for GPS-derived locations.

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