Missing Data in a Long Food Frequency Questionnaire
Missing Data in a Long Food Frequency Questionnaire is a scholarly work by Gary E. Fraser, published in 2009 in ''Epidemiology''. The main subjects of the publication include medicine, questionnaire, food security, econometrics, imputation, cohort, statistics, DL-homocysteine, missing data, mathematics, and Mediterranean diet. Although some missing data represent true zeroes, much of it does not, and data are usually not missing at random.