Publication Bias

Many studies sit in a file drawer for years, never published, despite the valuable data they could contribute. Or, in many cases, studies are published but omit the boring results. [...] This problem is commonly known as publication bias, or the file drawer problem. 

Source: Michael Lewis. Flash boys: a Wall Street revolt. WW Norton & Company, 2014. [B026]

Publication bias [is a] possible cause of the “decline effect,” in which the size of a statistically significant effect declines over time. Why? One statistician found that “ninety- seven per cent of all published psychological studies with statistically significant data found the effect they were looking for” 

Source: John H. Johnson. Everydata: The Misinformation Hidden in the Little Data You Consume Every Day, 2016 [B035]