Regional Data Need Comparable Definitions
Match the cards using the notes about Date mismatch, Boundary mismatch, Unit mismatch and Measure mismatch.
About 15 minutes, plus any extended practice
Supplied materials
- Paper and pencil; drawing or spoken answers are welcome.
- Topic notes: Date mismatch: records refer to different times. Boundary mismatch: records cover differently defined areas. Unit mismatch: quantities use different measurement units. Measure mismatch: records count different kinds of things.
- Original exercise cards: Fictional comparison uses one region’s 1990 record and another’s 2020 record. / Fictional comparison uses a city and its wider metropolitan area as if identical. / Fictional comparison treats square miles as square kilometres. / Fictional comparison treats households as people. / A table silently adds surrounding counties to one region. / A table compares dollars with thousands of dollars without conversion. / A table treats total population as population density. / A table compares different census years.
Learn the idea
A regional comparison must use matching dates, boundaries, units and measures. A larger total may reflect a larger area rather than a different rate. A region’s averages also hide variation within it. These fictional data checks ask which feature prevents a like-for-like comparison.
Date mismatch: records refer to different times. Boundary mismatch: records cover differently defined areas. Unit mismatch: quantities use different measurement units. Measure mismatch: records count different kinds of things.
Check what differs between the two records: date, area boundary, measurement unit or what is counted. Read the notes and the word cards. You can write, draw or say your answer.
- Read the four notes. Find the words Date mismatch, Boundary mismatch, Unit mismatch, Measure mismatch.
- Check what differs between the two records: date, area boundary, measurement unit or what is counted.
- Read the worked answer. Then try the other cards and explain which words helped you choose.
- Choose two different examples: one for Date mismatch and one for Boundary mismatch. Explain how their clues differ.
See the method in action
Worked example: The card says: “Fictional comparison uses one region’s 1990 record and another’s 2020 record.” That matches Date mismatch. Date mismatch is records refer to different times. Compare the note for Unit mismatch: Unit mismatch is quantities use different measurement units. That is a different clue.
Check your reasoning
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Helpful tips
- Check what differs between the two records: date, area boundary, measurement unit or what is counted.
- If you are unsure, ask an adult to read the card again. Match what this card says; do not add a new event or detail.
See the answer and explanation
Boundary mismatch
The card says: “Fictional comparison uses a city and its wider metropolitan area as if identical.” That matches Boundary mismatch. Boundary mismatch is records cover differently defined areas.
Take it further
New card: “A table compares different census years.” Match it with a note, then point to or say the words that helped. Check: The card says: “A table compares different census years.” That matches Date mismatch. Date mismatch is records refer to different times.
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More practice: try new cases
Choose an answer for each problem. Explain your method on paper, then use the feedback to decide what to revisit.
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Check the subject sources
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