application of statistical contrasts to mean refractive state
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ID: 227276
2006
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Abstract
Testing for differences between specific groups or combinations of groups is referred to as comparison or contrast testing. Statistical significance of comparisons can be assessed by first forming contrasts and then testing for their significance. A contrast essentially tests wheth-er or not two means are significantly different, where each mean could be a weighted average of two or more means. Gillan investigated whether the instillation of a cycloplegic (Mydriacyl 1% (tropicamide)) into the right eye of a 30-year-old female sub-ject would affect the variability of her distance refractive state as measured by an autorefractor.The purpose of this paper is to introduce mutually orthogonal linear contrasts of sample data to optometric research. By constructing particular contrasts, mean refractive states are compared before instillation, before and after instillation, and after instillation.
| Reference Key |
abelman2006africanapplication
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| Authors | ;S Abelman |
| Journal | computers in human behavior |
| Year | 2006 |
| DOI |
10.4102/aveh.v65i1.250
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