ignorable

Able to be ignored.

Users on this Internet chat system are ignorable by right-clicking the user name.

Insignificant or trivial enough to be ignored.

Unrelated to the parameters being estimated

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.

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

Anything that can be ignored.

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.