Definition of "ignorable"

Although there is an abundance of statistical literature describing (complicated) methods that can be used to investigate whether or not one is dealing with ignorable or informative missing data in a longitudinal study (see, for instance, Diggle, 1989; Ridout, 1991; Diggle et al., 1994), it is basically quote easy to investigat this matter.

2003, Jos W. R. Twisk, Applied Longitudinal Data Analysis for Epidemiology

Another pertinent distinction in Rubin's missing data classification system is whether the missing data mechanism is ignorable.

2007, Patrick E. McKnight, Katherine M. McKnight, Souraya Sidani, Missing Data: A Gentle Introduction, page 50

If θ and φ are not functionally related to each other (or that the knowledge of one does not provide any information about the other) then the parameters are called “distinct,” and the missing data mechanism is ignorable.

2015, Trivellore Raghunathan, Missing Data Analysis in Practice, page 6

So long as people like Mr Spearing stop at this point and resort to adjectives instead of numbers, so long will engineers, and probably also decision makers, continue to treat intangibles as ignorables.

1969, Michael Huxley, The Geographical Magazine, volume 42, page 389