The ssdsims_cost_calibration object shipped with the package and returned by
ssd_cost_calibration(). It carries the per-ci_method cost-model
coefficients (base, slope, n0), the bounded nrow_factor, a
fixed_addend (sample + fit per-task overhead), and the provenance of the
machine it was fitted on. ssd_estimate_cost() uses it when no calibration
is supplied.
Format
An ssdsims_cost_calibration object: a list with coefficients (a
tibble of ci_method, base, slope, n0), nrow_factor (a tibble of
nrow, factor), fixed_addend (a scalar), and provenance (cpu, R
version, ssdtools version, date, sweep grid).
Source
Fitted by ssd_calibrate_cost() during package development
(Intel Xeon @ 2.10 GHz, R 4.5.3, ssdtools 2.6.0.9002).
Details
Because the coefficients are architecture-specific, this default yields a
ballpark estimate sized for the machine in its provenance. Re-fit on your own
machine with ssd_calibrate_cost() for a trustworthy estimate. It was
produced by data-raw/cost_calibration.R (which simply runs
ssd_calibrate_cost()).