Animated demonstration of frequentist binomial convergence of probability using a coin flip.
Harmonic mean
PM 2.5 pollutant data from Pocatello Idaho.
Asthma repeated measures dataset from Littell et al. (2002)
Mack-Skillings test
Animated depiction of experimental designs
Soil potassium analyses from 8 laboratories
Mahalanobis distance for two sites using a pooled covariance matrix
Baby walking times experimental data
Modified Levene's test
Functions for customizing correlation matrices
Monte Carlo hypothesis testing for two samples.
Kaplan-Meier survivorship.
Hodges-Lehman estimator of location
Potash/cotton strength data
Visualize t-tests
Preston diversity analysis
Conducts pairwise post hoc and planned comparisons associated with an ANOVA
Huber M-estimator iterative least squares algorithm
Chi plots for diagnosing multivariate independence.
Grizzly bear litter sizes
An agricultural split plot design
DEM data from the Starkey experimental forest in NE Oregon.
Z and t confidence intervals for mu.
Winsorize data
Tippett cuckoo egg data
Environmental data for the community dataset cliff.sp
Trim data
GUI display of probability
Snoring and heart disease contingency data
Mouse life expectancy data.
Population levels in various countries since 1980
Power analysis for a one sample z-test
Jacknife pseudo-values
Geometric mean
Functions for calculating alpha diversity.
Corn yield data
CO2 exchange time series data
Animated demonstration of randomized sampling designs
Bivariate boxplots
Esophageal cancer data modified slightly to create a balanced three-way
factorial design
One sample z-test
Variance and standard error estimators for the sampling distribution of the sample mean
Alpine soil temperature and moisture time series
Repeated measures data for an exercise experiment.
Portneuf River longitudinal N and P data.
Rat glycogen data from Sokal and Rohlf (2012).
World CO2 levels, by country, from 1980 to 2006
Shading functions for interpretation of pdf probabilities.
Barro Colorado Island Tree Counts
Unbalanced and balanced linear models
Calculation and display of concordant and discordant pairs
Visualize pdfs
R hat MCMC convergence statistic
Partial residual plots for interpretation of multiple regression.
Visualize important non-linear functions
Venn probability diagrams for an event with two outcomes
Split plot computer chip data from Littell et al. (2006).
Agresti-Pendergrast test
Visual illusions illustrating human preception errors.
Maximum likelihood algorithm for determining the binomial dispersal coefficient
Species richness and environmental variables from Mt Washburn
One sided confidence interval for mu.
Mule deer telemetry data
Animated and/or snapshot representations of a statistic's sampling distribution
Garment Latin square data from Littell et al. (2002)
Partial correlations of determination in multiple regression
Huber M-estimator of location
Calculates kappa statistic and other classification error statistics
Gibbs sampling of normal hierarchical models
Matched pairs schizophrenia data
Nearest neighbor boundary coordinates
Interactive self-testing statistical questions
Brunner-Dette-Munk test
Animation demonstrations of confidence intervals.
Visualize the sampling distribution of Pearson's product moment correlation
Bayesian graphical summaries for discrete data.
Interactive depiction of type I and II error
Glucose Levels Following Alcohol Ingestion
Doornick-Hansen test for multivariate normality.
Animated plot of least squares function.
Animated plots of log-likelihood functions
Frigatebird drumming frequency data
Animated depictions of population growth
Robust test for random factors using trimmed means.
A simple function for bootstrapping
Bombus pollen data.
Mountain goat data from Yellowstone National Park
Interactive visualization of least squares regression.
Bat forearm length as a function of bat age
Calculates joint confidence intervals for parameters in linear models using a Bonferroni procedure.
Multiple pairwise comparison procedure to accompany a Friedman test.
SO2 data for 32 US cities with respect to 6 explanatory variables
Animated plot of least squares function.
Interactive depiction of type I and type II error and power
Interactive worksheet for logical and fallacious arguments
Bromus tectorum dataset
ANOVA linear models
Visualize random effects model
Robust one way trimmed means test.
Refinery CO dataset
Tree presence/absence data from Barro Colorado island
G-tests
Fisher's Rothamsted potato data
Transition matrix analysis
Interactive depiction of the ANOVA mechanism
Depict the effect of range on correlation
Sample mode
Animation of Markov Chain Monte Carlo walks in bivariate normal space
Agricultural randomized block design
Bootstrap CI of M-estimators differences of two samples
Huber one step M-estimator
Yellowstone NP cliff community data
ant honeydew data
Animated depiction of six-sided die throws.
Polyamine data from Hollander and Wolfe (1999)
Wood boring beetle data.
Confidence intervals for stratified random samples.
Plots confidence intervals for objects from class pairw
Percentage bend correlation
make plots of bivariate normal distributions
Confidence interval for sigma squared.
Fruit weight data from Littell et al. (2002)
Animated demonstration of density for a continuous pdf
Agresti crabs dataset
Mountain island biogeographic data
Confidence interval for the median
Maternal deer data
Animated depictions of Lotka-Volterra competition and exploitation models
Regression linear model derivation from linear algebra
Barplots with error bars for pairwise comparisons.
Tukey's test of additivity.
prediction sum of squares
Magnet pain relief data
AIC, AICc, BIC, Mallow's Cp, and PRESS evaluation of linear models
Plots a simple linear regression along with confidence and prediction intervals.
Permutation test for two and three way factorial designs.
Visualize the Hardy Weinberg equlibrium
loess 2D and 3D smooth plots
Spider web length data
Biweight midvariance, and biweight midcorrelation.
May's effective specialization index
Interactive smoother demonstrations
Anscobe's quartet
Perpendicularity
Visualization of the M-estimation function
Pulldown menus for 'asbio' interactive graphical functions
Veneer data from Littell et al. (2002)
Angle of azimuth to a boundary.
Plant traits for 136 species
Confidence interval estimation for the binomial parameter p.
One sample t-test
Multiple pairwise comparison procedure to accompany a Kruskal-Wallis test
Visualize exponential power functions
Heart rate data from Milliken and Johnson (2009)
Sample skewness and kurtosis