rockchalk

Superimpose regression lines on a plotted plane

Find numeric columns, center them, re-name them, and join them with the original data.

Central Tendency estimates for variables

Cheating and Looting in Japanese Electoral Politics

A way of checking if a string is a valid file name.

Check a matrix for positive definitness

recode a factor by "combining" levels

Calculates the "center" quantiles, always including the median, when n is odd.

Returns center values of x, the mean, mean-std.dev, mean+std.dev

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

Create a uniquely named directory. Appends number & optionally date to directory name.

draw a normal distribution with beautiful illustrations

Create a focal value vector.

Prints out the contents of an object created by summarizeFactors in the style of base::summary

Reformat numeric summarize output as one column per variable, similar to R summary

Generates a data frame for regression analysis

Generates a data frame for regression analysis.

Generate correlated data for simulations (third edition)

Generate correlated data (predictors) for one unit

retrieves estimates of the coefficient of determination from a list of regressions

Calculates the delta R-squares, also known as squared semi-partial correlation coefficients.

Select focal values from an observed variable.

Calculates partial correlation coefficients after retrieving data matrix froma fitted regression model

Converts the R-square to the variance inflation factor

Group Mean Center: Generate group summaries and individual deviations within groups

Calculate excess kurtosis

Create correlation matrices.

Create covariance matrix from correlation and standard deviation information

Estimate leave-one-variable-out regressions

magRange Magnify the range of a variable.

Create Symmetric Matrices, possibly covariance or correlation matrices, or check a matrix for symmetry and serviceability.

makeVec for checking or creating vectors

Multi-collinearity diagnostics

Illustrate multicollinearity in regression, part 1.

meanCenter

Create a "raw" (UNTRANSFORMED) data frame equivalent to the input data that would be required to fit the given model.

Create a data frame suitable for estimating a model

Minor revision of mvrnorm (from MASS) to facilitate replication

Create a newdata frame for usage in predict methods

Creates a publication quality result table for regression models. Works with models fitted with lm, glm, as well as lme4.

Convert LaTeX output from outreg to HTML markup

Pad with 0's.

Creates a cross tabulation with counts and percentages

perspEmpty

Plot testSlopes objects

Assists creation of predicted value curves for regression models.

Regression plots with predicted value lines, confidence intervals, color coded interactions

Draw display for discrete predictor in plotSlopes

Draw a 3-D regression plot for two predictors from any linear or nonlinear lm or glm object

Create sequences for plotting

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.

Create predicted values after choosing values of predictors. Can demonstrate marginal effects of the predictor variables.

Display pctable objects

print method for output from summarize

print method for summary.pctable objects

Stack together data frames

Religious beliefs and crime rates

Remove NULL values variables from a list

Calculates a "residual-centered" interaction regression.

rockchalk: regression functions

Draw standard error bar for discrete variables

Calculate skewness

Estimate standardized regression coefficients for all variables

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.

Extracts numeric variables and presents an summary in a workable format.

Tabulates observed values and calculates entropy

Extract presentation from a pctable object

Hypothesis tests for Simple Slopes Objects

Convert the vech (column of strictly lower trianglar values from a matrix) into a correlation matrix.

Convert a half-vector (vech) into a matrix.

T-test for the difference in 2 regression parameters