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Statistics review 9: one-way analysis of variance.

Bewick V, Cheek L, Ball J - Crit Care (2004)

Bottom Line: This review introduces one-way analysis of variance, which is a method of testing differences between more than two groups or treatments.Multiple comparison procedures and orthogonal contrasts are described as methods for identifying specific differences between pairs of treatments.

View Article: PubMed Central - PubMed

Affiliation: School of Computing, Mathematical and Information Sciences, University of Brighton, Brighton, UK. v.bewick@brighton.ac.uk

ABSTRACT
This review introduces one-way analysis of variance, which is a method of testing differences between more than two groups or treatments. Multiple comparison procedures and orthogonal contrasts are described as methods for identifying specific differences between pairs of treatments.

Show MeSH
Box plots of plasma colloid osmotic pressure (COP) for each age group. Means are shown by dots, boxes indicate median and interquartile range, with vertical lines depicting the range.
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Figure 2: Box plots of plasma colloid osmotic pressure (COP) for each age group. Means are shown by dots, boxes indicate median and interquartile range, with vertical lines depicting the range.

Mentions: Where the treatment levels have a natural order and are equally spaced, it may be of interest to test for a trend in the treatment means. Again, this can be carried out using appropriate orthogonal contrasts. For example, in an investigation to determine whether the plasma colloid osmotic pressure (COP) of healthy infants was related to age, the plasma COP of 10 infants from each of three age groups, 1–4 months, 5–8 months and 9–12 months, was measured. The data are given in Table 9 and illustrated in Fig. 2.


Statistics review 9: one-way analysis of variance.

Bewick V, Cheek L, Ball J - Crit Care (2004)

Box plots of plasma colloid osmotic pressure (COP) for each age group. Means are shown by dots, boxes indicate median and interquartile range, with vertical lines depicting the range.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC420045&req=5

Figure 2: Box plots of plasma colloid osmotic pressure (COP) for each age group. Means are shown by dots, boxes indicate median and interquartile range, with vertical lines depicting the range.
Mentions: Where the treatment levels have a natural order and are equally spaced, it may be of interest to test for a trend in the treatment means. Again, this can be carried out using appropriate orthogonal contrasts. For example, in an investigation to determine whether the plasma colloid osmotic pressure (COP) of healthy infants was related to age, the plasma COP of 10 infants from each of three age groups, 1–4 months, 5–8 months and 9–12 months, was measured. The data are given in Table 9 and illustrated in Fig. 2.

Bottom Line: This review introduces one-way analysis of variance, which is a method of testing differences between more than two groups or treatments.Multiple comparison procedures and orthogonal contrasts are described as methods for identifying specific differences between pairs of treatments.

View Article: PubMed Central - PubMed

Affiliation: School of Computing, Mathematical and Information Sciences, University of Brighton, Brighton, UK. v.bewick@brighton.ac.uk

ABSTRACT
This review introduces one-way analysis of variance, which is a method of testing differences between more than two groups or treatments. Multiple comparison procedures and orthogonal contrasts are described as methods for identifying specific differences between pairs of treatments.

Show MeSH