Introduction to Lattice Graphics. Richard Pugh 4 th December 2012
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1 Introduction to Lattice Graphics Richard Pugh 4 th December 2012
2 Agenda Overview of Lattice Functions Creating basic graphics Panelled Graphics Grouped Data Multiple Variables Writing Panel Functions Summary
3 The Data We Will Use Something relevant and sector independent London Tube Performance Data from the TFL website Excess Travel Hours by Line tube-network-performance-data
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5 Overview of Lattice Graphics
6 Overview of Lattice Graphics One of the graphic systems of R (others include Traditional and GGPlot ) An implementation of the S+ Trellis Graphics Written by Deepayan Sarkar, Fred Hutchinson Cancer Research Center
7 List of Lattice Graphic Functions Function Description Graph Type xyplot Scatter plot Bivariate histogram Univariate histogram Univariate densityplot Univariate density line plot Univariate barchart Bar chart Univariate bwplot Box and whisker plot Bivariate qq Normal QQ plot Univariate dotplot Label dot plot Bivariate cloud 3D scatter plot 3D wireframe 3D surface plot 3D splom Scatter matrix plot Data Frame parallel Multivariate parallel plot Data Frame
8 Key Function Arguments Argument x data subset panel groups Description Plot definition, typically as a formula The data frame used for the graphic Any subsets to be applied to the data Function used to draw data in each panel Grouping variable for the plot Type of graph Formula Y axis X axis Z axis Univariate ~ Y Y - - Bivariate Y ~ X Y X - 3D Z ~ X*Y Y X Z Data Frame ~ Data Data - -
9 Creating Basic Graphics
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16 Panelled Graphics
17 Specifying Panels We can use the vertical pipe symbol in order to specify panels to be plotted This allows us to create the graphics by one or more variables
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22 Panel Variables During the plot creation, lattice builds a plot data frame containing the variables to plot By this time, any categorical by variables need to be factors So, either change them to characters or factors beforehand
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25 Panel Ordering! If you have a factor variable, the ordering of the panels is in graph and not table order (!!) We can resolve using as.table = TRUE Note that the converting of characters to factors uses alphabetical ordering
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29 Grouped Data
30 Grouped Data We can specify groupings within our data in order to plot these groupings separately By default, lattice will vary styling of the groups specified The key argument is the groups argument
31 Take care!
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33 Controlling Styles Best done via the underlying lattice style templates Use of par.settings argument which takes a list of styles We usually use a basic template and change elements of it The show.settings function lets you see the current (or adapted) styles
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38 Multiple Variables
39 Multiple Variables We can specify one or more X or Y axis variable in our lattice formula This can overwrite the groups input The outer argument controls how the multiple X/Y variables should be plotted
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45 Writing Panel Functions
46 Panel Functions For each lattice graph, R performs the following actions: Partitions the data Draws the graph outline (i.e. the panels ) Passes the data for each panel into the panel function We can overwrite this panel function and supply our own
47 Panel Functions The default panel function for a lattice function is panel.nameoffunction Let s look at panel.xyplot
48 Jitter & other less used bits Arguments for styling Let s write our own panel function.
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52 Now what? Now we can insert other functions into a panel function which will then impact each individual plot panel We can call: Lattice low level functions (lpoints, ltext, llines, lpolygon etc) Existing panel. functions that exist for this purpose
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55 Summary
56 Summary This was just a quick overview of lattice graphics I hope it was useful For more info, look in the Lattice book, find examples online or contact Mango
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