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This lesson is a part of the course Sampling and Estimation
In investment analysis, we observe two types of data, namely, time-series data and cross-sectional data.
Time-series data refers to observations made over a period of time at regular intervals. For example, when we take daily closing prices of a stock for 1 year, it is time-series data. The time unit of observation could be anything such as day, week, month, or year.
