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 coefficient of interest, γ1, is the percentage effect of HNC on air pollution. The vector ofcovariates, xt, includes indicator variables for month of the year, day of the week, and hour of theday as well as interactions between weekends and hour of the day. In addition, xt includes weathervariables including current and 1-hour lags of quartics in temperature, humidity, and wind speed.14Equation (1) is first estimated using least squares (OLS) for four different time windows rang-ing from 1986-1993 to 1989-1990. Windows smaller than two years are not considered becauseit becomes difficult to credibly control for seasonal variation. Limiting the...
Nội dung trích xuất từ tài liệu:
Impacts of Climate Change on Air Pollution Levels in the Northern Hemisphere
