Bortfall
Bortfall is a Swedish noun that denotes loss, disappearance, or failure to occur in a given context. In statistical and research contexts, bortfall refers to data that are missing or observations that are not available for analysis. This can result from nonresponse, withdrawal of participants, dropouts, or data recording problems. Bortfall can be classified as unit bortfall (the entire observation is missing) or item bortfall (specific data points are missing within a case).
In research, bortfall may bias results and reduce statistical power, especially if the missingness is related
Outside statistics, bortfall is also used to describe dropout in education or training programs and loss to
Etymology: bortfall is formed from the prefix bort- (away) and fall (an occurrence or fall), reflecting the