Lecture 1 Show
Discrete and continuous variables Levels of measurement Nominal Ordinal Interval Ratio One can think of nominal, ordinal, interval, and ratio as being ranked in their relation to one another. Ratio is more sophisticated than interval, interval is more sophisticated than ordinal, and ordinal is more sophisticated than nominal. I don't know if the ranks are equidistant or not, probably not. So what kind of measurement level is this ranking of measurement levels?? I'd say ordinal. In statistics, it's best to be a little conservative when in doubt. Two General Classes of Variables (Who Cares?) Ordinal scales with few categories (2,3, or possibly 4) and nominal measures are often classified as categorical and are analyzed using binomial class of statistical tests, whereas ordinal scales with many categories (5 or more), interval, and ratio, are usually analyzed with the normal theory class of statistical tests.� Although the distinction is a somewhat fuzzy one, it is often a very useful distinction for choosing the correct statistical test.� There are a number of special statistics that have been developed to deal with ordinal variables with just a few possible values, but we are not going to cover them in this class (see Agresti, 1984, 1990; O�Connell, 2006; Wickens, 1989 for more information on analysis of ordinal variables). General Classes of Statistics (Oh, I Guess I Do Care)
Survey Questions and Measures: Some Common Examples Yes/No Questions Likert Scales Physical Measures Counts Which of the following statements accurately describes the difference between interval measurement and ratio measurement?Which of the following statements describes the difference between interval measurement and ratio measurement. -Ratio measurement is used for continuous data, whereas interval measurement is used for noncontinuous data.
What is the difference between a ratio scale of measurement quizlet?The difference between a ratio scale and an interval scale is that the zero point on an interval scale is some arbitrarily agreed value, whereas on a ratio scale it is a true zero. For example, 0°C has been defined arbitrarily as the freezing temperature of water, whereas 0 grams is a true zero, that is, no mass.
Which of the following lists the types of measurement in order from weakest to strongest group of answer choices?The order of the traditional measurement scales presented above—nominal, then ordinal, then interval, then ratio—is from weakest to strongest in terms of statistical inference. If there is a choice among measurement scales, then always select the highest (i.e., strongest) scale.
What three attributes are used to determine the reliability of an instrument group of answer choices?There are three major categories of reliability for most instruments: test-retest, equivalent form, and internal consistency. Each measures consistency a bit differently and a given instrument need not meet the requirements of each. Test-retest measures consistency from one time to the next.
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