intensity: Blocking for Intensity Data Set

In ACSWR: A Companion Package for the Book "A Course in Statistics with R"

Description

The intent of this experiment is to help the engineer in improving the ability of detecting targets on a radar system. The two variables chosen which are believed to have the most impact on the detecting abilities of the radar system are marked as the amount of the background noise and the type of filter on the screen.

Usage

data(intensity)

Format

A data frame with 24 observations on the following 4 variables.

Intensity

intensity of targets

Operator

different operators who form the blocks 1 2 3 4

Filter

two types of filter 1 2

Ground

the type of background noise high low medium

References

Montgomery, D. C. (1976-2012). Design and Analysis of Experiments, 8e. J.Wiley.

Examples

data(intensity)
intensity.aov <- aov(Intensity~Ground*Filter+Error(Operator),intensity)
summary(intensity.aov)
intensity.aov

Example output

Error: Operator
          Df Sum Sq Mean Sq F value Pr(>F)
Residuals  3  402.2   134.1               

Error: Within
              Df Sum Sq Mean Sq F value   Pr(>F)    
Ground         2  335.6   167.8  15.132 0.000253 ***
Filter         1 1066.7  1066.7  96.192 6.45e-08 ***
Ground:Filter  2   77.1    38.5   3.476 0.057507 .  
Residuals     15  166.3    11.1                     
---
Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1

Call:
aov(formula = Intensity ~ Ground * Filter + Error(Operator), 
    data = intensity)

Grand Mean: 94.91667

Stratum 1: Operator

Terms:
                Residuals
Sum of Squares   402.1667
Deg. of Freedom         3

Residual standard error: 11.57824

Stratum 2: Within

Terms:
                   Ground    Filter Ground:Filter Residuals
Sum of Squares   335.5833 1066.6667       77.0833  166.3333
Deg. of Freedom         2         1             2        15

Residual standard error: 3.329998
Estimated effects may be unbalanced

ACSWR documentation built on May 2, 2019, 6:53 a.m.