droplowest {ProfessR}

Drop lowest grade

Description

Drop the lowest grade from a matrix of grades. Matrix is assumed to be N by m where m is the number of exams (columns), N the number of students (rows)

Usage

droplowest(z)

Arguments

z

Matrix of scores, rows are students, columns are exam scores

Details

Best matrix output is sorted, so the grades do not reflect the original order of exam scores. To drop the two lowest scores, apply this program twice, running it a second time on the best outut.

Value

minind

Index of minimum score

best

matrix of scores with the lowest dropped

midgrade

mean value of best scores

Author(s)

Jonathan M. Lees<[e-mail]>

See Also

do.grades

Examples

#########   generate fake exam scores, 10 students, 3 exams
z = matrix(runif(3*10, 50, 100), ncol=3   )
 A  = droplowest(z)
 cbind(A$best,  A$minind, z, A$midgrade)