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 columns visible in the current data mask (e.g., inside mutate()) via dplyr::pick().

Value

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