Table 1.
Number or articles per journal: (1) that mentioned ‘outlier’,(2) that were checked by Bakker & Wicherts [23], (3)that involved the removal of outlier(s) and the use of a t or F test, (4) in which no values were removed, and (5) in which no outliers were removed and a t or F test was used.
Figure 1.
Flowchart of papers in the set of papers that stated outlier removal (left) and the set of papers that did not report any removal of outliers (right).
Table 2.
Median (mean) number of statistics per article for each journal and results of the Wilcoxon test.
Table 3.
Median (and mean) of the median p value per article for each journal and results of the Wilcoxon test.
Figure 2.
Distribution of p values reported as being significant (at p<.05) in 92 papers from which outliers were removed (N = 1781; in black) and in 61 papers that did not report any removal of outliers (N = 886; in grey).
Table 4.
Number of statistics, number of errors, number of large errors, and number of gross errors for each journal separately for articles in which outliers were removed and for articles that did not report any removal of outliers.
Table 5.
Number of articles, number articles with at least one error, number of articles with at least one large error, and number of articles with at least one gross error for each journal separately for articles in which outliers are removed and for articles that did not report any removal of outliers.
Table 6.
Results of the negative binomial regressions for all errors, large reporting errors, and gross errors.
Table 7.
Median (mean) of the median sample size per article for each journal and results of the Wilcoxon test.