Application of statistical contrasts to mean refractive state

African Vision and Eye Health

Field Value
Title Application of statistical contrasts to mean refractive state
Creator Abelman, S
Subject — Multiple comparisons, contrasts, hypothesis testing
Description 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.
Publisher AOSIS
Date 2006-12-19
Type info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion — —
Format application/pdf
Identifier 10.4102/aveh.v65i1.250
Source African Vision and Eye Health; South African Optometrist: Vol 65, No 1 (2006); 27-33 2410-1516 2413-3183
Language eng
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Coverage — — —
Rights Copyright (c) 2006 S Abelman