first-hand data
nounUK /ˌfɜːstˈhænd ˈdeɪtə/
US /ˌfɜːrstˈhænd ˈdeɪtə/
First-hand data is information you get yourself, not from someone else.
The scientist collected first-hand data by measuring the plants in the garden.
RELATED WORDS
OTHER MEANINGS
2. Information gathered directly from the original source.
Her report was based on first-hand data from the interviews.
3. Facts you see or experience yourself rather than read about.
He had first-hand data about the storm because he was there.
4. Measurements or notes taken by the person doing the study.
The students used first-hand data from their own weather station.