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92 7 Analysis of varianceto 20, and 4 for 21 or more. The GRAPHICS option controls whether a high-resolution ora line-printer graph is plotted; by default GRAPHICS=high.The PSE option specifies the type of error bar to be plotted with the means, withsettings:differencesaverage standard error of difference;lsdaverage least significant difference;meansallmeansaverage effective standard error for the means;plots plus and minus the effective standard erroraround every mean.The LSDLEVEL option sets the significance level (%) to use for the least significantdifferences (default 5). The allmeans setting is often unsuitable for plots other thanbarcharts when there are GROUPS, as the plus/minus e.s.e. bars may overlap each other.You can define the table of means to plot explicitly, by specifying its classifying factorsusing the XFACTOR, GROUPS, TRELLISGROUPS and PAGEGROUPS parameters. TheXFACTOR parameter defines the factor against whose levels the means are plotted. Witha multi-way table, there will be a plot of means against the XFACTOR levels for everycombination of levels of the other factors classifying the table. The GROUPS parameterspecifies factors whose levels are to be included in a single window of the graph. So, forexample, if you specifyAGRAPH [METHOD=line] XFACTOR=A; GROUPS=BAGRAPH will produce a plot of the means in a single window with factor A on the x-axis,and a line for each level of the factor B. You can set GROUPS to a pointer to specifyseveral factors to define groups. For examplePOINTER [VALUES=B,C] GroupfactorsAGRAPH [METHOD=line] XFACTOR=A; GROUPS=Groupfactorsto plot a line for every combination of the levels of factors B and C. Similarly, theTRELLISGROUPS option can specify one or more factors to define a trellis plot. Forexample,AGRAPH [METHOD=line] XFACTOR=A; GROUPS=B; TRELLISGROUPS=Cwill produce a plot for each level of C, in a trellis arrangement; each plot will again havefactor A on the x-axis, and a line for each level of the factor B. Likewise, thePAGEGROUPS parameter can specify factors whose combinations of levels are to beplotted on different pages. SoAGRAPH [METHOD=line] XFACTOR=A; GROUPS=B; PAGEGROUPS=Cwill produce a plot for each level of C, but now on separate pages. Multi-way tables canplotted even if the corresponding model term was not in the ANOVA analysis. For exampleyou can plot a two-way table even if the analysis contained only the main effects of thetwo factors; however, the lines will then all be parallel and no standard errors or LSDscan be included.The NEWXLEVELS parameter enables different levels to be supplied for XFACTOR if theexisting levels are unsuitable. If XFACTOR has labels, these are used to label the x-axisunless you set option XFREPRESENTATION=levels.The TITLE, YTITLE and XTITLE parameters can supply titles for the graph, the y-axisand the x-axis, respectively.
In Figure 7.7, we have used the commandAGRAPH [METHOD=line] S; GROUPS=Nto plot mean yields, as points joinedby lines, against the level of sulphurfor each level of nitrogen.7.6 Plots of means 93Figure 7.7
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1.1 Menus and windows 3Figure 1.3Ot
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1.1 Menus and windows 7Figure 1.11
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1.1 Menus and windows 9Lower quarti
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the help page about the command PRI
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1.3 Commands 15Figure 1.26In GenSta
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2 Data structuresIn this chapter yo
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20 2 Data structuresThe factor Amou
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22 2 Data structures2.3 Forming fac
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24 2 Data structuresYou can filter
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26 3 Syntaxaltogether; default labe
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28 3 SyntaxString tokens can always
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30 3 Syntax3.3 PracticalUse the VAR
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32 3 SyntaxPRINT [SERIAL=no] branch
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34 3 Syntaxplaces in the GenStat la
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36 3 Syntax(5) * (star) defines fac
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Page 47 and 48: 4.6 Practical 43GenStat adds by def
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Page 53 and 54: 5.1 Calculations 49Most practical c
Page 55 and 56: SQRT(x) square root of x, for x 0.
Page 57 and 58: 5.1 Calculations 53pay1 pay2 pay3 p
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Page 61 and 62: 5.3 Subsets of data values 5750 " A
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Page 66 and 67: 62 6 Regressionwhere a can be inter
Page 68 and 69: 64 6 Regression2 2called the adjust
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Page 76 and 77: 72 6 RegressionChange -1 -0.184 0.1
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Page 80 and 81: 76 6 Regression72 0.699 0.05295 1.1
Page 82 and 83: 78 6 Regressionallows you to choose
Page 84 and 85: 80 6 Regression15 RDISPLAY [PRINT=a
Page 86 and 87: 7 Analysis of varianceGenStat has v
Page 88 and 89: 84 7 Analysis of varianceterms for
Page 90 and 91: 86 7 Analysis of varianceGrand mean
Page 92 and 93: 88 7 Analysis of varianceThe Residu
Page 94 and 95: 90 7 Analysis of variance8 TREATMEN
Page 98 and 99: 94 7 Analysis of variance7.7 Split-
Page 100 and 101: 96 7 Analysis of varianceStandard e
Page 102 and 103: 8 Using commands with menus or spre
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Page 108 and 109: 9 Programs and proceduresThe standa
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Page 116 and 117: 112 9 Programs and procedures11 LIS
Page 118 and 119: 114 9 Programs and procedures9.7 Ot
Page 120 and 121: 10 Further informationGenStat has e
Page 122 and 123: 118 IndexGrouped data 73in regressi
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