aggr_data function

Aggregate data

Given a matrix of configurations (covariates and responses) unit-by-unit, this function finds the corresponding matrix of distinct configurations and the corresponding vector of frequencies (it does not work properly with missing data).

aggr_data(data, disp=FALSE, fort=FALSE)

Arguments

• data: matrix of covariate and unit-by-unit response configurations
• disp: to display partial results
• fort: to use fortran routines when possible

Returns

• data_dis: matrix of distinct configurations

• freq: vector of corresponding frequencies

• label: the index of each provided response configuration among the distinct ones

Author(s)

Francesco Bartolucci - University of Perugia (IT)

Examples

# draw a matrix of random responses and find distinct responses
X = matrix(sample(5,100,replace=TRUE),50,2)
out = aggr_data(X)

# find the distinct responses and the corresponding vector of frequencies
# for naep data
data(naep)
X = as.matrix(naep)
out = aggr_data(X)
length(out$freq)