NO.PZ201512020300000202
问题如下：
2. Did Batten’s regression analyze cross-sectional or time-series data, and what was the expected value of the error term from that regression?
选项：
Data Type
Expected Value of Error Term
Time-series
0
Time-series
εi
Cross-sectional
0
解释：
A is correct.
because the data are time series, and the expected value of the error term, E(Ԑ), is 0.
老师，这题不是说用这家公司的数据和美国的CPI指数去回归吗？那不是cross series吗
