# Polynomial distributed lags

`matrix-pdl.Rd`

Creates a regressor matrix for polynomial distributed lags.

## Arguments

- x
a numeric vector.

- d
an integer specifying the order of the polynomial.

- q
an integer specifying the number of lags to use in creating polynomial distributed lags. This must be greater than

`d`

.- trim
a logical flag; if

`TRUE`

, the missing values at the beginning of the returned matrix will be trimmed.