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In all cases homogeneity of variances was assumed.
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We should be cautious in interpreting the results and applying the statistical techniques of processing control charts to measure case homogeneity in medical expenditures.
In case homogeneity is not rejected a common effect seems likely to be present, and differences between individual studies are a consequence of sampling variation.
Isolated Hypoplastic Left Heart Syndrome (HLHS) and Transposition of the Great Arteries (TGA) were chosen for investigation based on their relatively high case numbers locally, case homogeneity and existing literature suggesting a significant proportion of cases were diagnosed antenatally in pregnancies subject to fetal anomaly scanning.
In all cases, variance homogeneity was tested using Levenes's test and transformed if necessary (square root).
Finally, in both cases, the homogeneity is lower than in E1-E6.
In cases where homogeneity of variance was violated the 'Equal variance not assumed' statistic is reported.
In many cases, the homogeneity of the preparations and the presence of contaminating kinase activities were not systematically addressed.
In all cases the homogeneity in the target volume was improved for the inversely planned IMRT compared to the 3D-planned conventional radiotherapy (CRT).
The log transformed data set did not violate the assumptions of either normality (Kolmogorov-Smirnov test: p > .05 in all cases) or homogeneity of variance (Levene's F; p > .05 in all cases).
In those cases where homogeneity could be assumed, a univariate ANOVA was conducted to identify significant group differences and follow-up Dunn Sidak analyses were used to identify pair-wise comparisons that reached the 0.05 level of significance.
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CEO of Professional Science Editing for Scientists @ prosciediting.com