Summary of changes | Drive-time areas saved with versions 0.1 and 0.2 | Running an older analysis again | Building drive-time areas again | Saved results in the cache

The sites and the example data | The five steps, one at a time | Steps 1 and 2: downloading and routing | Step 3: overlapping tracts and their weights | Step 4: margins of error | Step 5: rates | The same result in one call | Tables for a report | A plain table with the main columns | Rates by site and drive time | Sites ranked by a rate | One site at three drive times | A table to save | A map | Running on your own sites | References

Area weighting and its assumption | Coverage weights and area shares | How the package chooses the weights | Measuring the areas | The calculation for each site | Recomputing the weights for one site | References

What catchmentACS does | Install | A first run on the example data | Reading the result | A map of the drive-time areas

From tract estimates to drive-time areas | The symbols, the weights, and the estimates | Kinds of estimate and their weights | A worked example with both weights | Margins of error | Limitations | References

Stage 1: the drive-time area | Stage 2: the tracts and their weights | Stage 3: one ACS variable | Stage 4: the five rates | All four maps in one call

What the margins of error assume | Standard errors and the 90 percent level | Counts, medians, and per-person values | Rates: the proportion and ratio formulas | A negative value under the square root | Zero denominators and missing values | A count: its margin of error from the tract margins | A rate that falls back to the ratio formula | References

A rate is the ratio of two weighted counts | The five rates | Two formulas for the margin of error of a rate | The formula used for each rate | Two rates computed by hand | snap_rate with the ratio formula | labor_force_participation with the proportion formula | All five rates of the example | A rate whose numerator is missing | References

What each service needs | Census API key | OSRM | openrouteservice | Supplying drive-time areas and ACS estimates | What is not implemented yet | The cache | A run that contacts both services

The value of the expression in cacs_capture_conditions() | Drive-time areas built on the public OSRM server | The isochrone column of the list-column form | The row order of as_tibble() | Rates by site in summary(), print(), and Markdown tables | Values in rates_breakdown before 0.4

Medians and per-person values | The year argument | Saved ACS estimates and the Census API key | Sites as a plain data frame | The isochrone column when cacs_run() builds the areas | Choices that are not implemented