Log-Linear Projection (data-masked, dplyr-native)

Fits a log-linear trend log(value) ~ t on a calibration window and projects it for rows on/after start_date. Designed for use inside dplyr verbs (no need to pass .).

Usage

logLinearProjection(
  date,
  value,
  start_date,
  end_date,
  group = NULL,
  data = NULL
)

Arguments

date

Bare column name for the date variable (coercible to Date).

value

Bare column name for the positive numeric series to project.

start_date

Date or string coercible to Date; start of calibration.

end_date

Date or string coercible to Date; end of calibration.

group

Optional bare column name to group by before projecting.

data

Optional data frame. If omitted, uses the current data mask (e.g., inside mutate()) via dplyr::cur_data_all().

Value

A numeric vector projection aligned to the input rows; NA before start_date. Respects grouping if group is supplied.