age_calc                Function to calculate age from date of birth.
autoplot.lm             A function to replicate the basic plot function
                        for linear models in ggplot2
cleanTex                Remove Unwanted LaTeX files after building
                        document
crosstabplot            Draw a visual crosstab (mosaic plot) with
                        shading for correlations and labels in each
                        cell.
crosstabs               Build a list of crosstabulations from a dataset
cutoff                  A function to calculate thresholds of
                        cumulative sums in a vector.
decomma                 Remove commas from numeric fields and return
                        them as numerics
defac                   Convert a factor to a character string safely
gelmansim               Generate prediction intervals for model
                        functions
isid                    A function to check if a set of variables form
                        a unique ID in a dataframe.
lag_data                Create a lag
leading_zero            Function to add leading zeroes to maintain
                        fixed width.
makenum                 a function to convert numeric factors into
                        numeric class objects
max_mis                 A function to safely take the maximum of a
                        vector that could include only NAs.
midsch                  A dataframe of aggregate test scores for
                        schools in a Midwest state.
moves_calc              Function to calculate the number of times a
                        student has changed schools.
nth_max                 Find the nth maximum value
profpoly                Creates a proficiency polygon in ggplot2 for
                        showing assessment categories
profpoly.data           Creates a data frame suitable for building
                        custom polygon layers in ggplot2 objects
remove_char             A function to replace an arbitrary character
                        like a "*" in redacted data with an NA in R
retained_calc           Function to calculate whether a student has
                        repeated a grade.
statamode               A function to mimic the mode function in Stata.
stuatt                  Student Attributes from the Strategic Data
                        Project Toolkit
stulevel                A synthetic data set of K-12 student
                        attributes.
theme_dpi               a defunct ggplot2 theme developed for PDF and
                        PNG for use at the Wisconsin Department of
                        Public Instruction
theme_dpi_map           a defunct ggplot2 theme developed for PDF or
                        SVG maps
theme_dpi_map2          an alternate defunct ggplot2 theme developed
                        for PDF or SVG maps
theme_dpi_mapPNG        a defunct ggplot2 theme developed for PNG or
                        JPG maps
thresh                  A function to return the maximum percentage of
                        the cumulative sum represented by a subset of
                        the vector
