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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The data described above allow us to calculate the number of
years of a given student’s early childhood in which television sig-
nals were available. In order to make the magnitudes we measure
in the analysis below more easily interpretable, we will also use
data on the rate at which television ownership actually diffused
among households in each county. We will use the term televi-
sion exposure to refer to the expected number of years a child’s
household owned a television during the child’s preschool years.
To construct our measure of exposure, we collect annual data
on television penetration for U.S. counties. We combine the 1950
and 1960 U.S. Census...
Nội dung trích xuất từ tài liệu:
Hybrid Broadcast Broadband TV
