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Estimating Methods, Variability, and Sampling for Drop-Test Data

Appendix (Continued)

design graphic

Analysis of Variance

An example of an analysis of variance (ANOVA) model (figure 21).

*** Analysis of Variance Model ***

Short Output:

Cell:

aov(formula - Continuous - Ret + FlowRate, data - LineLengths05, qr - T, n.action - na.exclude)

Terms:

  Ret FlowRate Residuals
Sum of Squares 2790.75 7140.25 26.50
Deg. of Freedom 1 1 3

Residual standard error: 2.972092

Estimated effects may be unbalanced

  Df Sum of Sq Mean Sq F Value Pr(F)
Ret 1 2790.75 2790.750 315.9340 0.0003882841
FlowRate 1 7140.25 7140.250 808.3302 0.0000955337
Residuals 3 26.50 8.833    

Tables of means

Grand mean

 569.5

Ret

  GTSR Water
  554.25 600.00
rep 4.00 2.00

FlowRate

  High Low
  527.25 590.63
rep 2.00 4.00

Figure 21—Analysis of variance results.


Appendix continued...

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