Some statements point the other way
A questionnaire can ask about a trait with statements pointing in either direction. Saying that a quietness statement describes you very well should not add the same Extraversion points as saying that a talkative statement describes you very well.
In the IPIP inventory used here, responses range from 1 to 5. A positively keyed item keeps that value; a negatively keyed item uses 6 minus the value. A response of 5 becomes 1, 4 becomes 2, and the midpoint of 3 stays 3. The key is fixed before anyone answers.
A clearer scale, not new evidence
Each trait contains ten statements. After reversal, the sum runs from 10 to 50. Wabiro displays (sum − 10) ÷ 40 × 100, placing the same information on a 0–100 scale. A raw sum of 42 becomes 80/100.
That transformation does not compare you with anyone. A percentile would require appropriate reference data for the same instrument, population, scoring rules and language. Without it, “80/100” cannot become “higher than 80% of people”.
Small changes need context
A retake can differ because your answers changed, your circumstances changed or you read a statement differently. A difference is not automatically meaningful improvement or decline. Keep the questionnaire version and conditions in view, and look for examples in ordinary life before drawing a conclusion.
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