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

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- 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.

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.

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