A public health task force is designing a comprehensive registry to track outcomes of patients with chronic cardiovascular conditions. The database architect requires the medical team to classify each collected variable into its fundamental statistical data type to ensure appropriate downstream statistical analysis. Match each clinical variable collected in the registry to its correct statistical data type.
- Serum B-type natriuretic peptide (BNP) concentration measured in pg/mLContinuous variable
- New York Heart Association (NYHA) functional classification (Class I, II, III, or IV)Ordinal variable
- Total number of emergency department visits recorded over a 365-day periodDiscrete variable
- Patient primary language spoken at home for discharge instruction planningNominal variable
Cevap
Serum BNP concentration is a continuous variable. NYHA functional classification is an ordinal variable. Total number of emergency department visits is a discrete variable. Patient primary language is a nominal variable.
Proper classification of variables dictates the appropriate descriptive statistics and inferential statistical tests that can be performed. Continuous variables can take any value, discrete variables are countable integers, ordinal variables have a logical rank but unequal intervals, and nominal variables are purely named categories without order.
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Anahtar Kavram
Data types in biostatistics are fundamentally divided into numerical (continuous, discrete) and categorical (ordinal, nominal) classifications.