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 What is an example of nominal level of measurement?In nominal measurement the numerical values just “name” the attribute uniquely. No ordering of the cases is implied. For example, jersey numbers in basketball are measures at the nominal level.
Which variable is in a nominal level of measurement?In a nominal level variable, values are grouped into categories that have no meaningful order. For example, gender and political affiliation are nominal level variables. Members in the group are assigned a label in that group and there is no hierarchy.
Which of the following variables is an example of a nominal level variable?An example of nominal would be gender, or race/ethnicity. Race/ethnicity as a variable could be broken into several categories such as African American, Latino, White, Asian American, etc.
What is a nominal level of measurement?Nominal level of measurement is the least precise and informative, because it only names the 'characteristic' or 'identity' we are interested. In other words, in nominal variables, the numerical values just "name" the attribute uniquely. In this case, numerical value is simply a label.
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