Definition of "nondetection"

Nondetection or nonnotification of cancer has been shown to be most common among patients older than 75 years at the time of diagnosis.

1986, Journal of the National Cancer Institute: JNCI, volume 77, page 661

Still, at the 3 sigma level, there is about a 50% chance of a false negative if data are censored below that level and are treated as nondetections.

2008, C. Swyngedouw, R. Lessard, “Quality Control in Soil Chemical Analysis”, in Soil Sampling and Methods of Analysis‎, page 56