Explanation 1
Time series: daily visits for two weeks.
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Lesson 3 of 12
Recognize when data describes change through time, a snapshot across units, or a panel-style combination.
Theory
Time series data tracks a variable through ordered periods, so date order and periodicity matter. Cross-sectional data compares many units at a single time or period. A panel-style data set follows several units through time, which combines both ideas.
Explanation 1
Time series: daily visits for two weeks.
Explanation 2
Cross-sectional: learner snapshot by province and device.
Explanation 3
Panel preview: repeated learner rows across several dates.
Interactive Mission
Periodicity matters because the order of dates carries meaning.
R connection
Use a line chart for dates and a bar chart for a cross-sectional category.
Live R Lab
Compare a daily time series with a cross-sectional learner snapshot using clear plots.
Ready to run
Worked example
Scenario
A manager asks whether site traffic is improving and which devices learners use. The first question needs a time-ordered trend; the second needs a snapshot comparison.
Chart choice follows data shape.
Assistant
Help me decide whether an example is time series, cross-sectional, or panel-style, and ask me one question at a time.
Exit check
Use the hint button if you need coaching before answering. Explanations appear after you check or submit.
Checkpoint
Question 1 of 2. Answered 0/2. Passing score: 70%.