Phân tích tư tưởng của nhân dân qua đoạn thơ: Những người vợ nhớ chồng… Những cuộc đời đã hóa sông núi ta trong Đất nước của Nguyễn Khoa Điềm
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DEVELOPMENT OF A 'STANDARD' TELEVISION CAMERA MODEL IMPLEMENTED IN THE TLCI-2012
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To select sample schools, the surveyors first chose schoolswith
twelfth grades. Then, for each school containing a twelfth grade,
they identified the middle and elementary schools that “fed” their
students into the secondary school. If a lower-grade school fed
more than 90% of its students into the selected twelfth-grade
school, then it was sampled with certainty; other lower-grade
schools were sampled in proportion to the share of their students
who were fed into the twelfth-grade school. The Coleman data con-
tain a school identifier variable unique to each sampled school con-
taining a twelfth grade. For students in lower-grade schools, this
identifier refers to the sampled twelfth-grade school intowhich the
students...
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