An equity analyst gathers total returns for three country equity indexes over the past four years. The data are presented below.

Time Period	Index A	Index B	Index C
Year t3	15.56%	11.84%	4.34%
Year t2	4.12%	6.96%	9.32%
Year t1	11.19%	10.29%	12.72%
Year t	8.98%	6.32%	21.44%

		Nominal data
		time-series data
		cross-sectional data
		panel data