Term
| Measures of Central Tendency |
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Definition
| - descriptors of what is average in a sample group |
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Definition
| also called the average: sum of the scores (x) divided by the number of items (n). |
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Definition
| - the most common number or the number having the highest frequency in a set of measurements |
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Definition
| - the counted middle or the midpoint number when a series of measurements are arranged in order |
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Definition
| the way scores differ, vary, disperse around the mean |
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Definition
| - spread between the highest and lowest score; (limited usefulness; must first be displayed in ascending order) |
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Definition
| - measure of the average deviation or spread of scores around the mean |
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Definition
| - used to analyze descriptively the spread of scores in a distribution; the greater the dispersion of scores around the mean, the greater the SD; mathematically speaking, it is the positive square root of the variance |
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Definition
| - Divides the data into 4 parts centered on the median |
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Term
| Lower quartile/25% percentile |
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Definition
| - number below which 25% of the data points fall |
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Term
| Upper quartile/75th percentile |
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Definition
| - number above which 25% of the data points fall |
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Definition
| - A description of the spread or variation (i.e. smallest to largest) of the data points in a data set |
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Definition
| - In any normal distribution, 68% of the data points or observations fall within one standard deviation of the mean, 95% fall within two standard deviations, and 99.7% fall within three standard deviations of the mean. |
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Definition
| - relationship between risk factors and disease |
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Definition
| - implication that the risk factor(s) cause(s) the disease or outcome observed |
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Definition
| - used in case-control / retrospective studies, measures the odds of having the risk factor if the disease is present |
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Definition
| - in prospective studies; measures the risk that an individual will develop an adverse outcome over a specified time given the exposure |
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Definition
| - The probability that a condition will be correctly identified by a test or index. The ability to detect a quality if it is present |
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Definition
| - Ability of a test to distinguish between those who do and do not have a disease or condition |
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