Covariance analysis requires the slopes of the regression lines fitted to each group to be parallel, so the test of parallelism (nonsignificant stage or species by dose interaction effect) is tested before comparing stage or species effects ( Follett and Armstrong, 2004).Īs mentioned, the actual dose to achieve quarantine security at a given level of precision may exceed the dose predicted from small-scale dose–response tests. Covariance analysis is an alternative to compare response among stages or between species. These analyses are used to compare radiation tolerance among life stages or species and to help identify a target dose for large-scale testing. Probit analysis has been the standard method to evaluate dose–response data, but other models such as complementary log–log should be used if they provide a better fit to the data ( Robertson and Preisler, 1992 Maindonald et al., 2001), which is often the case. Follett, in Irradiation for Quality Improvement, Microbial Safety and Phytosanitation of Fresh Produce, 2017 Data Analysis
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