recode a factor by "combining" levels
Create a uniquely named directory. Appends number & optionally date to directory
name.
Create a focal value vector.
draw a normal distribution with beautiful illustrations
Multi-collinearity diagnostics
Display pctable objects
Illustrate multicollinearity in regression, part 1.
Plot testSlopes objects
Create predicted values after choosing values of predictors. Can
demonstrate marginal effects of the predictor variables.
Remove NULL values variables from a list
Assists creation of predicted value curves for regression models.
Prints out the contents of an object created by summarizeFactors
in the style of base::summary
Create correlation matrices.
Create covariance matrix from correlation and standard deviation
information
Central Tendency estimates for variables
meanCenter
Calculates a "residual-centered" interaction regression.
Extract presentation from a pctable object
Cheating and Looting in Japanese Electoral Politics
Create a "raw" (UNTRANSFORMED) data frame equivalent to the input
data that would be required to fit the given model.
Generates a data frame for regression analysis.
Hypothesis tests for Simple Slopes Objects
Create a newdata frame for usage in predict methods
print method for output from summarize
print method for summary.pctable objects
Creates a publication quality result table for
regression models. Works with models fitted with lm, glm, as well
as lme4.
Extracts numeric variables and presents an summary in
a workable format.
Generate correlated data for simulations (third edition)
Tabulates observed values and calculates entropy
Calculates the delta R-squares, also known as squared
semi-partial correlation coefficients.
Convert the vech (column of strictly lower trianglar values from a matrix) into a correlation matrix.
Select focal values from an observed variable.
Create Symmetric Matrices, possibly covariance or correlation
matrices, or check a matrix for symmetry and serviceability.
makeVec for checking or creating vectors
Convert a half-vector (vech) into a matrix.
Stack together data frames
Religious beliefs and crime rates
T-test for the difference in 2 regression parameters
Generate correlated data (predictors) for one unit
retrieves estimates of the coefficient of determination from a list of regressions
Estimate leave-one-variable-out regressions
magRange
Magnify the range of a variable.
Regression plots with predicted value lines, confidence intervals, color coded interactions
Draw display for discrete predictor in plotSlopes
Generic function for plotting regressions and interaction effects
Calculate a predicted value matrix (fit, lwr, upr) for a
regression, either lm or glm, on either link or response scale.
rockchalk: regression functions
Returns center values of x, the mean, mean-std.dev, mean+std.dev
Draw standard error bar for discrete variables
Select most frequently occurring values from numeric or categorical variables.
Create an ordinal variable by grouping numeric data input.
Summary stats table-maker for regression users
Calculates partial correlation coefficients after retrieving data matrix froma fitted regression model
Converts the R-square to the variance inflation factor
Create a data frame suitable for estimating a model
Minor revision of mvrnorm (from MASS
) to facilitate replication
Creates a cross tabulation with counts and percentages
perspEmpty
Draw a 3-D regression plot for two predictors from any linear or nonlinear lm or glm object
Create sequences for plotting
Sorts numeric from discrete variables and returns separate
summaries for those types of variables.
Extracts non-numeric variables, calculates summary information,
including entropy as a diversity indicator.
A way of checking if a string is a valid file name.
Reformat numeric summarize output as one column per variable,
similar to R summary
Check a matrix for positive definitness
Generates a data frame for regression analysis
Group Mean Center: Generate group summaries and individual deviations within groups
Calculate excess kurtosis
Convert LaTeX output from outreg to HTML markup
Pad with 0's.
Calculate skewness
Estimate standardized regression coefficients for all variables
Superimpose regression lines on a plotted plane
Find numeric columns, center them, re-name them, and join them with the original data.
Calculates the "center" quantiles, always including the median, when n is odd.