To compare prices fairly, we match identical UPCs, consistent package sizes, and standardized service definitions. When exact matches fail, we use strict equivalence rules and document assumptions. This ensures differences reflect genuine pricing decisions rather than unit confusion, promotional timing, or category substitution errors that distort conclusions.
Pinpointing storefront entrances matters when a building spans a long block or wraps a corner. We combine official addresses, place identifiers, parcel centroids, and field observations to position price points accurately. That precision lets us evaluate adjacent blocks honestly, avoiding averages that blur real, walkable differences shoppers experience.
Prices breathe with promotions, supply shocks, and weekend surcharges. We define tight collection windows, annotate event flags like holidays or storms, and track hourly changes for services. By aligning timestamps across locations, we isolate persistent gaps from short-lived spikes, revealing durable edges rather than noisy, fleeting anomalies.
Carry a notebook, measuring tape for package dimensions, and a phone with location services. Ask permission before photographing, respect staff time, and avoid blocking entrances. Pair up for safety on late routes. These habits build trust, protect privacy, and keep your observations accurate, calm, and welcome in busy spaces.
After collecting, standardize item names, verify units, and flag promotions. Maintain versioned spreadsheets so comparisons remain traceable. When an item lacks a perfect match, document the rule you used. Clear lineage helps collaborators audit decisions, strengthening the credibility of every map, chart, and takeaway drawn from your dataset.
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