A ‘missing not at random’ (MNAR) and ‘missing at random’ (MAR) growth model comparison with a buprenorphine/naloxone clinical trial

A Technique for Incorporating Data Missing Not at Random (MNAR) into Bayesian Networks

We present a technique for incorporating data attributes that are supposed Missing Not at Random (MNAR) into Bayesian Networks (BNs). While traditional methods of incorporating data that is Missing at Random (MAR) into BNs are well documented, there are fewer tested methods for discovering and incorporating data Missing Not at Random (MNAR). We present a review of literature in BNs and missing ...

Missing not at random models for latent growth curve analyses.

The past decade has seen a noticeable shift in missing data handling techniques that assume a missing at random (MAR) mechanism, where the propensity for missing data on an outcome is related to other analysis variables. Although MAR is often reasonable, there are situations where this assumption is unlikely to hold, leading to biased parameter estimates. One such example is a longitudinal stud...

Simple imputation methods were inadequate for missing not at random (MNAR) quality of life data

OBJECTIVE QoL data were routinely collected in a randomised controlled trial (RCT), which employed a reminder system, retrieving about 50% of data originally missing. The objective was to use this unique feature to evaluate possible missingness mechanisms and to assess the accuracy of simple imputation methods. METHODS Those patients responding after reminder were regarded as providing missin...

Distinguishing "Missing at Random"i and "Missing Completely at Randomn"

What is the difference between missing completely at random and missing at random?

The terminology describing missingness mechanisms is confusing. In particular the meaning of 'missing at random' is often misunderstood, leading researchers faced with missing data problems away from multiple imputation, a method with considerable advantages. The purpose of this article is to clarify how 'missing at random' differs from 'missing completely at random' via an imagined dialogue be...