NO.PZ2018062004000113
问题如下：
Comparison of a company’s financial data across different time periods is called as:
选项：
A. cross-sectional analysis.
B. common-size analysis.
C. time-series analysis.
解释：
C is correct.Time-series analysis is the comparison of financial data across different time periods,while cross-sectional analysis compares a specific metric for one company with the same metric for group of companies in the same time period.
b选项指什么？面板数据吗？
