Sentence examples for missing variables as from inspiring English sources

Last, bias could be caused by missing variables, as follows.

In the structured part of our database, we labeled all missing variables as "missing".

sCr was the most common missing variable, as this was not at the time routinely collected by several organizations contributing data.

For all other variables there is a category for missing variables (indicated as '???' in Table  3).

We excluded cases with missing variables such as delivery mode or presentation (2%).

Furthermore the absence of a co-morbidity record was included in the multivariate model allowing the model to account for missing variables, particularly as they are not missing at random.

Responses coded as 'don't know/not sure', or 'refused' were treated as missing variables and excluded from analyses, as were respondents with missing data on any covariates.

This method models a missing variable Y as a linear combination of predictor variables X, finds the complete case whose Y estimate is closest to that of the current incomplete case, and takes the observed Y from the former as the imputed Y value for the latter.

For both criteria sets, if data were missing on any variables, total scores were calculated with the missing variable value taken as zero, and patients said to have met the criteria if they reached the defined cut-offs: ≥6/10 for the 2010 criteria and ≥4/7 for the 1987 criteria.

This is a secondary analysis of an observational trial, and this fact limits our ability to make conclusions, and even though adjustments are made for potential confounders, missed variables such as mechanical ventilation modes and intensity can also contribute to the observed mortality difference between groups.

Additional file 1. Number of patients with missings according to variable and characteristics of patients with and without prehensile grip strength as missing variable.