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 lists the type of measurement in order from weakest to strongest?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 is the main difference between a systematic measurement error and a random measurement error in research quizlet?Random errors occur because of random and inherently unpredictable events in the measurement process. Systematic errors occur when there is a problem in the measurement system that affects all measurements in the same way.
What three attributes are used to determine the reliability of an instrument?What are the three types of instrument validity? Content validity, criterion-related validity, and construct validity.
What is the fifth and final phase of the Stetler model?The five processes outlined in the Stetler Model are: (a) preparation, (b) validation, (c) comparative evaluation/ decision making, (d) translation/ application, and (e) evaluation (Stetler, 1994 (Stetler, , 2001 .
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