For every positive result published there are many more negative results (non-significant) that are withheld. Such selective publishing may be a deliberate attempt to deceive, but is more often a combination of ignorance and bias. This is exacerbated by journal reviewing practices that typically make it hard or impossible to publish non-significant results.
Also used in hcistats2e: Chap. 8: pages 91, 95; Chap. 9: page 105
Used in glossary entries: bias, negative results, non-significant result, positive results