Comparing methods for handling missing values in food-frequency questionnaires and proposing k nearest neighbours imputation: effects on dietary intake in the Norwegian Women and Cancer study (NOWAC) - Parr, Christine L; Hjartåker, Anette; Scheel, Ida; Lund, Eiliv; Laake, Petter; Veierød, Marit B (Public health nutrition, 2008)
Keywords: Aged; Bread; Cancer; Cohort Studies; Data Interpretation, Statistical; Diet; Diet - statistics & numerical data; Diet Surveys; Dietary intake; Energy; Energy intake; Epidemiology; Evidence-Based Medicine; Female; Fish oils; Food; Food intake; Humans; Investigations; Median (statistics); Middle Aged; Missing data; Norway; Nutrition; Nutrition research; Outcome Assessment (Health Care) - statistics & numerical data; Public health; Questionnaires; Reproducibility; Research Design - statistics & numerical data; Samples (statistical); Surveys and Questionnaires - standards; Variables; Norway; Food-frequency questionnaire; Imputation; Data quality; Missing values; Non-response; Bias