DatMA: Database of students' program choice for frame A

Description

This dataset contains some variables regarding the program choice for a sample of 180 students included in the sampling frame A.

Usage

DatMA

Arguments

Format

Id_Pop: An integer from 1 to $N$, with $N$ the number of students in the whole population, identifying the student within the population.
Id_Frame: An integer from 1 to $N_A$, with $N_A$ the number of students in the frame, identifying the student within the frame.
Prog: A factor with three categories (academic, general and vocation) indicating the program choice of the student.
Ses: An ordinal factor with three categories (low, middle and high) indicating the socio-economical status of the student.
Read: A number indicating the mark of the student in a reading test.
Write: A number indicating the mark of the student in a writing test.
Sch_Size: A number indicating the size of the school the students belongs to.
Domain: A string indicating the domain each student belongs to. Possible values are "a" if student belongs to domain a or "ab" if student belongs to overlap domain.
ProbA: First order inclusion probability in frame A.
ProbB: First order inclusion probability in frame B. This probability is 0 for students included in domain a.

Details

The sample, of size $n_A = 180$, has been drawn from a population of $N_A = 5500$ students according to a proportional-to-size sampling desing according to the size of the school. So, students attending bigger schools have a higher probability of being selected in the sample. $N_{ab} = 2000$ of the students composing the population belongs also to frame B.

Examples

Run this code

data(DatMA)
attach(DatMA)
#Let perform a brief descriptive analysis for the main variable
summary (Prog)
#And let do the same for the numerical auxiliary variables Read and Write
summary(Read)
summary(Write)