TPG2022 Chapter III paragraph 3.57

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It may also be the case that, while every effort has been made to exclude points that have a lesser degree of comparability, what is arrived at is a range of figures for which it is considered, given the process used for selecting comparables and limitations in information available on comparables, that some comparability defects remain that cannot be identified and/or quantified, and are therefore not adjusted. In such cases, if the range includes a sizeable number of observations, statistical tools that take account of central tendency to narrow the range (e.g. the interquartile range or other percentiles) might help to enhance the reliability of the analysis.

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