constructSYB {FAOSTAT}

Construct/Creat new variable.

Description

A function used to construct new variables from existing variables.

Usage

constructSYB(
  data,
  origVar1,
  origVar2,
  newVarName = NA,
  constructType = c("share", "growth", "change", "index"),
  grFreq = 1,
  grType = c("ls", "geo"),
  baseYear = 2000
)

Arguments

data

The data frame containing the raw variable

origVar1

The variable name to be used in construction, refer to Details for more information and useage.

origVar2

The variable name to be used in construction, refer to Details for more information and useage.

newVarName

The name assigned to the new variable, if missing then .SC/.SH/.GR/.CH will be appended depending on the type of construction

constructType

The type of construction, refer to Details for more information.

grFreq

The frequency for the growth rate to be computed.

grType

The method for the growth to be calculated, currently supports least squares and geometric.

baseYear

The base year to be used for constructing index.

Details

Currently two types of construction are supported, either share or growth rate computation.

Share can be a share of total or share of another variable depending on whether an additional variable is supplied or not.

Value

A data frame containing both the original data frame and the processed data and also a list indicating whether the construction passed or failed.