LMest (version 3.1.2)

matrices2long: From data in array format to data in long format

Description

Function to convert data with array format in data with long format.

Usage

matrices2long(Y, X1 = NULL, X2 = NULL)

Value

Returns a data.frame with data in long format. The first column indicates the name of the unit identifier, and the second column indicates the time occasions.

Arguments

Y

array of responses (n x TT x r)

X1

array of covariates (n x TT x nc1)

X2

array of covariates (n x TT x nc2)

Author

Francesco Bartolucci, Silvia Pandolfi, Fulvia Pennoni, Alessio Farcomeni, Alessio Serafini

Details

Y, X1 and X2 must have the same number of observations.

Examples

### Example with data on self rated health

data(data_SRHS_long)
SRHS <- data_SRHS_long[1:1600,]

# Covariates

X <- cbind(SRHS$gender-1,
           SRHS$race == 2 | SRHS$race == 3,
           SRHS$education == 4,
           SRHS$education == 5,
           SRHS$age-50,
           (SRHS$age-50)^2/100)

# Responses

Y <- SRHS$srhs


res <- long2matrices(SRHS$id, X = X, Y = Y)

long <- matrices2long(Y = res$YY, X1 = res$XX)