Flashcards
Portnoy Ch 8
Cards in this deck (17)
- 1dichotomous variablecan only take on 2 values (e.g. yes/no)
- 2polytomous variablecan have multiple values (e.g. 5-point scale)
- 3continuous variablecan have any value within a defined range (e.g. weight in lbs)
- 4discrete variablecan only be described in whole integer units (e.g. HR in Beats Per Minute)
- 5Direct measureused for observations that can be directly made, such as ROM in degrees or length in centimeters
- 6Indirect measure (AKA proxy measure)for measurements that are not directly observable, e.g. the height of a column of mercury to measure temperature
- 7abstract variableMeasured as some value assumed to represent the underlying variable (e.g. intelligence, health, strength)
- 8What are the 4 levels of measurement?nominal, ordinal, interval, ratio
- 9Define nominal scaleClassifications. Items are in no relative order, and numbers, letters, or words can be used as category labels. Examples: blood type, gender, diagnosis.
Arithmetic properties: counting (frequency) - 10Define ordinal scaleNumbers indicate rank order. Intervals are inconsistent or not known. Examples include: manual muscle test, function, pain
Arithmetic properties: counts, percentages. Medians are useful for central tendency, cannot be added, subtracted, multiplied, or divided - 11Define interval scaleNumbers indicate rank order and demonstrate equal intervals. No true zero. Examples include temperature in F or C.
Arithmetic properties: addition/subtraction - 12Define ratio scaleNumbers indicate equal values and have a true zero. Examples: age, height, weight.
Arithmetic properties: addition, subtraction, multiplication, and division - 13What is the difference between a numeral and a number?Numerals are labels with no quantitative meaning; a number represents a known quantity of a variable
- 14Define precision p. 107the exactness of a measure. For statistical purposes, the term is usually used to indicate the # of decimal places to which a number is taken
- 15Define construct p. 43 & 108Concepts that represent nonobservable behaviors or events.
(Also called latent variable, latent trait) - 16Parametric testsapply arithmetic manipulations,
requiring interval or ratio data - 17Nonparametric testsdo not make the same assumptions as parametric and are designed to be
used with ordinal and nominal data
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- Graduate OTD 8262 Research Quant Flashcards on Portnoy Ch 8, created by Deborah Kofsky on 04/01/2021.
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