Non-ignorable missingness

Mon, 01 Jan 0001 00:00:00 +0000

Statistics is basically a missing data problem!

– Little 2013

Nearly all samples – whether by design or by accident – are incomplete. We very rarely make a complete census of all individuals in a population or all sites on a landscape. Sometimes we don’t collect, or can’t collect, complete information for individual samples or measures. For instance, we might know an animal was alive when it was last seen, so we know it survived at least that long, but know nothing about its current status. Or we might have information on the coverage of an invasive species down to a certain patch size, beyond which patches are too small or numerous to survey.

Ignorability on Models for missing data

Non-ignorable missingness