Forecast total fertility rate (TFR) or mean age of the mother at birth (MAB)

Usage

forecast_tfr_mab(
  topic,
  topic_data,
  trend_model,
  temporal_model,
  temporal_end = NA,
  constant_model
)

topic: character, defines the parameter to calculate (tfr or mab).
topic_data: data frame, input data tailored to the topic with variables: spatial_unit, nat, year, either tfr or mab. This data is obtained by the function create_input_data(). Columns for spatial_unit and/or nat are optional.
trend_model: vector, specifies the model type (ARIMA or lm), the first (start) and last (end) year. If an lm model is used, the window of past years (trend_past) and the proportional amount of past years used to fit the model (trend_prop) can be specified.
temporal_model: vector, model type (cubic, Bezier or constant), first and last year, proportion of trend (trend_prop), proportion for slopes (z0_prop) and proportion of the slope at the end point (z1_prop).
temporal_end: data frame, contains y-values at the end of the temporal forecast period (y_end).
constant_model: model type (constant), first and last year.

data frame, predictions for either tfr or mab.