ResearchValidation study
Sample: repeat canopy readings by two observers
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Summary
This study checks whether two people using the sample app at the same plots get the same answer. Each of 30 plots is photographed twice, by different people, within two days. There are no results yet. This page states in advance what will count as a pass.
- App tested
- Sample app, version 1.2
- Compared against
- The same plots read again by a second observer within two days
What counts as a pass
The app passes if two observers’ readings at the same plot agree within ±5 percentage points at 90% or more of plots.
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No results yet. They are added here when the study ends, and judged against the pass threshold above.
Method
Thirty plots will be placed at random across three stands of differing density. Each plot is photographed with the sample app by one observer, then again by a second observer within two days, following the same four-direction procedure. Neither observer sees the other’s readings.
The difference between the two readings at each plot is the measure of repeatability. The pass threshold above was set before any photos were taken.
Sources
- Bland, J. M., & Altman, D. G. (1986). Statistical methods for assessing agreement between two methods of clinical measurement. The Lancet, 327(8476), 307–310.
How to cite
Author, S. (2026). Sample: repeat canopy readings by two observers [Validation study]. fun.limited. http://fun.limited/research/sample-study-in-progress/