tfr.median.set {bayesTFR} R Documentation

## Editing Medians of the Projection

### Description

These functions are to be used by expert analysts. They allow to change the projection medians either to specific values or shift the medians by a given constant, or by a specific adjusting procedure.

### Usage

tfr.median.set(sim.dir, country, values, years = NULL)

tfr.median.shift(sim.dir, country, reset = FALSE, shift = 0,
from = NULL, to = NULL)

tfr.median.adjust(sim.dir, countries, factor1 = 2/3, factor2 = 1/3, forceAR1 = FALSE)

tfr.median.reset(sim.dir, countries)


### Arguments

 sim.dir Directory containing the prediction object. country Name or numerical code of a country. countries Vector of country names or codes. values Array of the new median values. years Numeric vector giving years which values correspond to. Ideally it should be of the same length as values. If it is NULL, values are set starting from the first prediction period. If values correspond to consecutive years, only the first year might be given here. A year t represents a prediction period [t_i, t_{i+1}] if t_i < t \leq t_{i+1}. reset Logical. If TRUE medians in a range of from and to are reset to their original values. shift Constant by which the medians should be offset. It is not used if reset is TRUE. from Year from which the offset/reset should start. By default, it starts at the first prediction period. to Year until which the offset/reset should be done. By default, it is set to the last prediction period. factor1, factor2 Adjusting factors for the first and second projection period, respectively (see below). forceAR1 Logical. If TRUE, the given countries are forced to enter Phase III (i.e. the AR(1) process) in the first projection period.

### Details

The function tfr.median.set can be used to set the medians of the given country to specific values. Function tfr.median.shift can be used to offset the medians by a specific constant, or to reset the medians to their original BHM values. Function tfr.median.adjust runs the prediction procedure for the given countries with an additional decrement in the model in the first two projection periods. In the first projection period it is computed as factor1*S where S is a difference between observed decrement and the expected decrement (by the double logistic function) in the last observed period. In the second projection period, in the formula factor1 is replaced by factor2. If forceAR1 is set to TRUE, we recommend to set factor1 and factor2 to 0. The function then calls tfr.median.set in order to store the new median for each country. Function tfr.median.reset resets medians of the given countries to the original values.

In all four functions, if a median is modified, the corresponding offset is stored in the prediction object (element median.shift) and the updated prediction object is written back to disk. All functions in the package that use trajectories and trajectory statistics use the median.shift values to offset the results correspondingly.

### Value

All three functions return an updated object of class bayesTFR.prediction.

### Author(s)

Hana Sevcikova, Leontine Alkema

[Package bayesTFR version 7.1-1 Index]