How deeply does The Well-Grounded Data Analyst cover percentage change?

Calculates, visualizes, cleans, and qualifies percentage change, while stopping short of a general statistical treatment.

Percentage change

As explained in The Well-Grounded Data Analyst

Percentage change is the relative increase or decrease between an initial value and a later value, expressed as a percentage.

Percentage change measures relative movement between an initial and later value. For product sales, it exposes shifts that absolute volume differences can hide, especially across products with very different sales levels. section 4.4.3

A practical analysis workflow is:

Add minimum-volume thresholds when small baselines create misleadingly large percentages. section 4.4.3

Why the denominator matters

Increasing sales from one item to five produces a 500% change, while increasing sales from 500 to 1,000 produces a smaller percentage change but represents many more additional sales. Treat the percentage alongside baseline volume. section 4.4.3

How The Well-Grounded Data Analyst covers it

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Also explained in

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Data Storytelling with Altair and AIA percentage increase is a measure of relative growth calculated by dividing the change in a quantity by its original value and expressing the result as a percentage.
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Investing for ProgrammersA percentage change is the relative increase or decrease in a quantity expressed as a percentage of its original value.

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Related concepts

volumemeasures · A volume metric quantifies the amount, frequency, or level of activity, transactions, units, or other measured phenomena within a specified scope and period.
historical returnproduces · A historical return is the realized percentage change in an investment's value over a completed past period.
evaluationmeasured by · Evaluation is the systematic assessment of a system, result, or approach against relevant criteria, evidence, or objectives.
visualizationaddresses · Visualization is the representation of data, information, or concepts in visual form to support inspection, interpretation, analysis, or communication.
tourist arrivalsmeasures · Tourist arrivals are recorded entries or visits by tourists to a destination or accommodation establishment during a specified period.
investingproduces · Investing is the allocation of money or other resources to an asset, venture, or undertaking with the expectation of obtaining a future benefit or return.

This explainer was generated by Manning's knowledge graph from the text of The Well-Grounded Data Analyst. The section links point to the parts of the book it draws on.