The document provides three tips for effective data classification: maintaining a code sheet to understand data better, identifying data types to determine suitable calculations, and ensuring that the data is sensible by checking for illegal values. It emphasizes the importance of knowing how to categorize and analyze different types of data. The document concludes with an invitation to obtain more data skills for free.

1. Top 3 Tips for
Effective Data
Classification
Lee Baker
CEO
Chi-Squared Innovations

2. Tip 1: Keep a Code Sheet
Do you understand
these data?
(no, me neither…)

3. What if I gave you a
codes sheet?
(that’s better…)

5. Tip 2: Identify Your Data Types
Data
Quantitative
Ratio Interval
Qualitative
Ordinal Nominal

6. Data type tells you which calculations you can and cannot do:
Ordinal NominalRatio Interval
Median
Mean
Mode
most appropriate measure of centrality

8. Tip 3: Check That Your Data are Sensible
Negative Age
Too Tall!
Illegal Values

10. Thank You
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