Between-Source Variation
Definition
The variation observed among samples from different locations in the reference population. Used to estimate the probability of the observed similarity under the different-source hypothesis.
Related terms
- Denominator Hypothesis
- The defence hypothesis under which the LR denominator is calculated. Typically: the questioned sample comes from some other location within the relevant...
- ENFSI Verbal Scale
- A standardised table published by the European Network of Forensic Science Institutes that maps ranges of LR values to verbal expressions of...
- Numerator Hypothesis
- The prosecution hypothesis under which the LR numerator is calculated. In a source comparison it is typically: the questioned sample and the...
- Tippett Plot
- A calibration diagnostic plot that shows the cumulative distributions of LR values calculated for known same-source pairs and known different-source pairs. Well-calibrated...
- Within-Source Variation
- The natural variation observed among multiple samples collected from a single source location. Used to estimate the probability of the observed difference...
Explained in
- Likelihood Ratios and Verbal Scales in Geological EvidenceThe variation observed among samples from different locations in the reference population. Used to estimate the probability of the observed similarity under th...