TY  - BOOK
AU  - Spencer, Bruce D.
AU  - Foran, Wendene
TI  - Sampling probabilities for aggregations, with application to NELS:88 and other educational longitudinal surveys
KW  - AVALUO EDUCATIVO
KW  - ESTUDIO LONGITUDINAL
KW  - INSPECCIONES NACIONALES
KW  - MUESTREO
KW  - PROBABILIDAD
N1  - Julio 1991
ER  -