ez (version 4.1-1)

ez-package: Easy analysis and visualization of factorial experiments

Description

This package facilitates easy analysis of factorial experiments, including purely within-Ss designs (a.k.a. repeated measures), purely between-Ss designs, and mixed within-and-between-Ss designs. The functions in this package aim to provide simple, intuitive and consistent specification of data analysis and visualization. Visualization functions also include design visualization for pre-analysis data auditing, and correlation matrix visualization. Finally, this package includes functions for non-parametric analysis, including permutation tests and bootstrap resampling. The bootstrap function obtains predictions either by cell means or by more advanced/powerful mixed effects models, yielding predictions and confidence intervals that may be easily visualized at any level of the experiment's design.

Details

ll{ Package: ez Type: Package Version: 4.1.1 Date: 2012-08-11 License: GPL-3 LazyLoad: yes } This package contains several useful functions:

• ezANOVA

{ Provides simple interface to ANOVA, including assumption checks.} ezBoot{ Computes bootstrap resampled cell means or lmer predictions} ezCor{ Function to plot a correlation matrix with scatterplots, linear fits, and univariate density plots} ezDesign{ Function to plot a visual representation of the balance of data given a specified experimental design. Useful for diagnosing missing data issues.} ezMixed{ Provides assessment of fixed effects in a mixed effects modelling context.} ezPerm{ Provides simple interface to the Permutation test.} ezPlot{ Uses the ggplot2 graphing package to generate plots for any given user-requested effect, by default producing error bars that facilitate visual post-hoc multiple comparisons.} ezPlot2{ When supplied the results from a call to ezPredict or ezBoot, plots predictions with confidence intervals.} ezPrecis{ Provides a summary of a given data frame.} ezPredict{ Computes predicted values from the fixed effects of a mixed effects model.} ezResample{ Resamples data, useful when bootstrapping.} ezStats{ Provides between-Ss descriptive statistics for any given user-requested effect.} progress_time{ A progress bar that estimates time remaining.} This package also contains two data sets: ANT{ Simulated data from the Attention Network Test} ANT2{ Messy version of the ANT data set}

See Also

ANT, ANT2, ezANOVA, ezBoot, ezCor, ezDesign, ezMixed, ezPerm, ezPlot, ezPlot2, ezPrecis, ezPredict, ezResample, ezStats, progress_time