# HH v1.8

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## Support software for Statistical Analysis and Data Display by Richard M. Heiberger and Burt Holland

Support software for Statistical Analysis and Data Display (Springer, ISBN 0-387-40270-5). This contemporary presentation of statistical methods features extensive use of graphical displays for exploring data and for displaying the analysis. The authors demonstrate how to analyze data---showing code, graphics, and accompanying computer listings---for all the methods they cover. They emphasize how to construct and interpret graphs, discuss principles of graphical design, and show how accompanying traditional tabular results are used to confirm the visual impressions derived directly from the graphs. Many of the graphical formats are novel and appear here for the first time in print. All chapters have exercises.

## Functions in HH

 Name Description ci.plot Plot confidence and prediction intervals for simple linear regression interaction2wt Plot all main effects and twoway interactions in a multifactor design norm.curve plot a normal or a t-curve with both x and z axes. plot.mmc.multicomp MMC (Mean--mean Multiple Comparisons) plot. vif Calculate the Variance Inflation Factor regr1.plot plot x and y, with optional straight line fit and display of squared residuals ancova Compute and plot oneway analysis of covariance col.hh Initializing Trellis Displays simint.reverse Force all comparisons in a "hmtest" from simint to have the same sign. push.vp.hh push and pop a grid viewport, turn clipping off, change scale. strip.xysplom strip function that is able to place the correlation or regression coefficient into the strip label. as.multicomp Support functions in R for MMC (mean--mean multiple comparisons) plots. if.R Conditional Execution for R or S-Plus hov Homogeneity of Variance simint.mean MMC (mean--mean multiple comparisons) plots from the sufficient statistics for a one-way design. anova.mean ANOVA table from the group sample sizes, means, and standard deviations. position Find or assign the implied position for graphing the levels of a factor. hh Resolve filenames relative to the HH directory. grid.yaxis.hh make x- and y-axis labels ladder Draw a "ladder of powers" plot, plotting each of several powers of y against the same powers of x. X.residuals Residuals from the regression of each column of a data.frame against all the other columns. panel.interaction2wt Plot all main effects and twoway interactions in a multifactor design panel.xysplom panel method for xysplom. simint.mmc MMC (mean--mean multiple comparisons) plots. panel.cartesian trellis panel function, with labeled rows and columns and without strip labels. multicomp.order Update a multicomp object by ordering its contrasts. panel.bwplot.intermediate.hh Panel functions for bwplot. resid.squares plot squared residuals in inches to match the y-dimension objip loop through all attached directories looking for pattern lm.case case statistics for regression analysis plot.hov Homogeneity of Variance Plot HH-package Support software for Statistical Analysis and Data Display by Richard M. Heiberger and Burt Holland panel.ci.plot Default Panel Function for ci.plot do.formula.trellis.xysplom Interprets model formulas for xysplom and extended bwplots xysplom scatterplot matrix with potentially different sets of variables on the rows and columns. odds.ratio Calculate or plot the odds ratio for a 2x2 table of counts. partial.corr partial correlations export.eps Exports a graph to an EPS file. t.trellis Interchange the x- and y-axes for an S-Plus trellis object. Identity function for an R lattice object. No Results!