factor_exposure_constraint: Constructor for factor exposure constraint

In R-Finance/PortfolioAnalytics: Portfolio Analysis, including Numerical Methods for Optimization of Portfolios

Description

The factor exposure constraint sets upper and lower bounds on exposures to risk factors. This function is called by add.constraint when type="factor_exposure" is specified, see add.constraint

Usage

  factor_exposure_constraint(type = "factor_exposure",
    assets, B, lower, upper, enabled = TRUE,
    message = FALSE, ...)

Arguments

type	character type of the constraint
assets	named vector of assets specifying initial weights
B	vector or matrix of risk factor exposures
lower	vector of lower bounds of constraints for risk factor exposures
upper	vector of upper bounds of constraints for risk factor exposures
enabled	TRUE/FALSE
message	TRUE/FALSE. The default is message=FALSE. Display messages if TRUE.
...	any other passthru parameters to specify risk factor exposure constraints

Details

B can be either a vector or matrix of risk factor exposures (i.e. betas). If B is a vector, the length of B must be equal to the number of assets and lower and upper must be scalars. If B is passed in as a vector, it will be converted to a matrix with one column.

If B is a matrix, the number of rows must be equal to the number of assets and the number of columns represent the number of factors. The length of lower and upper must be equal to the number of factors. The B matrix should have column names specifying the factors and row names specifying the assets. Default column names and row names will be assigned if the user passes in a B matrix without column names or row names.

Value

an object of class 'factor_exposure_constraint'

Author(s)

Ross Bennett

See Also

add.constraint

R-Finance/PortfolioAnalytics documentation built on May 8, 2019, 4:46 a.m.