ldt (version 0.5.3)

eqList2Matrix: Convert a List of Equations to a Matrix

Description

This function takes a list of equations and a data frame, and returns a matrix where the response variables are in the first columns, and the predictor variables are in the subsequent columns.

Usage

eqList2Matrix(equations, data, addIntercept = FALSE)

Value

result

A matrix with response variables in the first columns, predictor variables in subsequent columns, and optionally an intercept column. The matrix does not contain duplicate columns.

numResponse

Number of response variables in the first columns.

Arguments

equations

A formula or a list of formula objects representing the equations.

data

A matrix or a data frame containing the variables in the equations.

addIntercept

Logical. If TRUE, an intercept column is added after the response variables. Default is FALSE.

Details

The function checks for duplicate response variables across equations and throws an error if any are found. It also ensures that predictor variables are not duplicated in the final matrix.

Examples

data <- data.frame(income = c(50000, 60000, 80000, 85000, 65000),
                   age = c(25, 32, 47, 51, 36),
                   education = c(16, 18, 20, 20, 16),
                   savings = c(20000, 25000, 30000, 35000, 40000))
equations <- list(as.formula("income ~ age + education"),
                  as.formula("savings ~ age + education"))
matrix_data <- ldt:::eqList2Matrix(equations, data, addIntercept = TRUE)
print(matrix_data)