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. 2016 Feb 18;4:e1715. doi: 10.7717/peerj.1715

Table 2. Problems in quantifying p-hacking and evidential value from a p-curve using text-mined data.

Cases where p-hacking not detected by binomial test Cases where right skew not due to evidential value
P-values are reported as p < .05 and so excluded from analysisa Where p-values used to confirm prior characteristics of groups being compareda,b
Limited power because few p-values between .04 and .05 Where p-values come from confirming well-known effects, e.g., demonstrating that a method behaves as expecteda,b
Where p-values ambiguous because rounded to two decimal placesa Where ‘double-dipping’ used to find ‘best’ data to analyse
P-values from model-fitting or testing of assumptions of statistical tests (where low p-value indicative of poor fit, or failure to meet assumptions)a,b

Notes.

a

Problems that can potentially be overcome by analysing data from meta-analyses.

b

Problems that are less likely to affect text-mined data from Abstracts.