Market Library
Good questions. Clear explanations.
10 articles · All topics
Market Library / 1
Foundations
What makes a fair comparison?
A comparison needs a common question before it needs a common chart.
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Calculations
Percentages are not percentage points
A difference between percentages and a percentage change use different denominators.
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Calculations
Put two series on the same starting line
Indexing to 100 compares proportional movement, not original price.
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Foundations
Does a higher price mean a bigger rise?
The height of a line is not a measure of its percentage growth.
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Reading charts
The window changes the story
Always attach a start and end to a statement about change.
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Reading charts
One unusual point can change the picture
Investigate an unusual observation before excluding it.
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Data quality
A gap is not a zero
Missing information should remain visible in the interpretation.
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Reading charts
When two lines belong on one chart
An overlay helps only when its shared scale has a clear meaning.
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Data quality
What a smoother line leaves out
A moving average trades detail for a broader view.
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Foundations
Same destination. Different journeys.
Net change cannot describe every movement along the way.
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