compute_accessdiff: Compute mean difference in accessibility
In transportfoundry/tvmeasures: Transit Vision Evaluation Measures

This function computes the average accessibility gain (positive changes only), optionally weighted by another statistic.

1	compute_accessdiff(project_tiff, base_tiff, weight_tiff = NULL)

`project_tiff`	A Conveyal raster layer containing accessibility statistics for a transit system with an added project
`base_tiff`	A Conveyal raster layer containing accessibility statistics for the base transit system.
`weight_tiff`	A Conveyal raster layer containing origin-side opportunities to use for weighting.

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clifton <- read_tiff(system.file("extdata", "clifton_am_jobs.tiff", package = "tvmeasures"))
base <- read_tiff(system.file("extdata", "base_am_jobs.tiff", package = "tvmeasures"))
compute_accessdiff(clifton, base)