Showing similarity of results given by two methods: a commentary |
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Authors: | Rita Hannu Ekholm Petri |
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Affiliation: | Finnish Environment Institute, P.O. Box 140, FIN-00251 Helsinki, Finland. hannu.rita@helsinki.fi |
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Abstract: | There is a frequent need in the environmental sciences to show the similarity of the results given by two analytical methods. This cannot, however, be done within the conventional 'there is a difference' statistical hypothesis setting of, among others, Student's t-test. We demonstrate here a more appropriate approach that originates from drug testing and that can be applied with standard statistical software. It is a challenging approach, as it requires quantification of the similarity limit. If no pre-determined value is given for similarity, a potential data-supported similarity limit can be explored from the data. The approach has numerous other potential application areas, e.g. parallelism of regression slopes, homogeneity of variances and lack of interaction. |
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