May's effective specialization index
Doornik-Hansen test for multivariate normality.
Calculates kappa statistic and other classification error statistics
R hat MCMC convergence statistic
Simple functions for MCMC demonstrations
Kullback test for equal covariance matrices.
Harmonic mean
Monte Carlo hypothesis testing for two samples.
Glucose Levels Following Alcohol Ingestion
Alpine soil temperature and moisture time series
Split plot computer chip data from Littell et al. (2006)
Maximum likelihood algorithm for determining the binomial dispersal coefficient
Frigatebird drumming frequency data
Animation demonstrations of confidence intervals.
Geometric mean
Mack-Skillings test
Calculation and display of concordant and discordant pairs
An agricultural split plot design
Functions for calculating alpha diversity.
Mahalanobis distance for two sites using a pooled covariance matrix
Hodges-Lehman estimator of location
Sample mode
Animated demonstration of frequentist binomial convergence of probability using a coin flip.
Soil potassium analyses from 8 laboratories
Anscombe's quartet
PM 2.5 pollutant data from Pocatello Idaho
PCBs and herring egg thickness
Anolis lizard contingency table data
Grizzly bear litter sizes
Animated demonstration of density for a continuous pdf
Preston diversity analysis
Animated depiction of six-sided die throws.
Wood boring beetle data
Bombus pollen data.
Area under a receiver operating characteristic (ROC) curve
CSIRO d13C-CO2 data from Rubino et al., A revised 1000 year atmospheric 13C-CO2 record from Law Dome and South Pole, Antarctica
Fern environmental sex determination data
Agrostis variabilis cover measurements
Aids and veterans dataset
Animated depiction of experimental designs
Confidence intervals for ratios of proportions when the denominator is known
Bone development data
Venn probability diagrams for an event with two outcomes
Confidence interval for sigma squared.
Asthma repeated measures dataset from Littell et al. (2002)
Ant honeydew data
Barplots with error bars (including interval plots)
Animated depictions of Lotka-Volterra competition and exploitation models
Bromus tectorum dataset
One sided confidence interval for mu.
Z and t confidence intervals for mu.
Animated plot of least squares function.
Baby walking times experimental data
Yellowstone NP cliff community data
Animated depictions of population growth
Hamilton depression scores before and after drug treatment
Animation of Markov Chain Monte Carlo walks in bivariate normal space
Animated demonstration of randomized sampling designs
Concrete strength dataset for data mining
Fly sex and longevity
Contingency data for high school marijuana, alcohol, and cigarette use
Animated plots of log-likelihood functions
Caribou count data
Dataset of mammal traits from Ramsey and Schaefer (1997)
Environmental data for the community dataset cliff.sp
Bayesian linear models with uniform priors
Confidence intervals for stratified random samples.
Esophageal cancer data modified slightly to create a balanced three-way
factorial design
Efficiency of a randomized block design compared to a CRD
Bat forearm length as a function of bat age
Animated plot of the least squares function.
Determine agreement of two classifications
Conversion of binary digits to decimal numbers
Pulldown menus for 'asbio' interactive graphical functions
Confidence interval for the product of two proportions
Confidence interval for the median
Bootstrap CI of M-estimators differences of two samples
Agresti crabs dataset
Australian frog calls following fire
Fruit weight data from Littell et al. (2002)
Mule deer telemetry data
Huber M-estimator iterative least squares algorithm
Likelihood ratio test for tabular data
Make plots of bivariate normal distributions
Bivariate boxplots
A simple function for bootstrapping
Maternal deer data
Tippett cuckoo egg data
Huber one step M-estimator
Agricultural factorial design
Heart rate data from Milliken and Johnson (2009)
Modified Levene's test
Huber M-estimator of location
Angle of azimuth to a boundary.
Patient responses to myeloma drug treatments
Dataset of salary attributes for male and female workers from Ramsey and Schafer (1997)
Visual illusions illustrating human perception errors.
Chronic ailment counts for urban and rural women in Australia
Datasets for resource use and availability
Enzymatic rate data for the phospholipase protein ExoU
Bootstrap confidence intervals
Jacknife pseudo-values
Repeated measures data for an exercise experiment.
Mosquito wing length data
Chi plots for diagnosing multivariate independence.
Confidence interval estimation for the binomial parameter pi using five popular methods.
Partial correlations of determination in multiple regression
Creosote bush counts
Mountain island biogeographic data
Corn yield data
Normal quantile plots for single or multiple factor levels
Kaplan-Meier survivorship.
A multivariate normal dataset for data mining
Mouse life expectancy data
AIC, AICc, BIC, Mallow's Cp, and PRESS evaluation of linear models
Nearest neighbor boundary coordinates
Functions for customizing correlation matrices
Welch tests controlled for simultaneous inference
Permutation test for two and three way factorial designs
crab gill and body weight data
Partial residual plots for interpretation of multiple regression.
Animated and/or snapshot representations of a statistic's sampling distribution
Nitrogen content of soils under pika haypiles
Depict the effect of range on correlation
Potash/cotton strength data
Percentage bend correlation
Rat glycogen data from Sokal and Rohlf (2012)
Dissolved levels in locations above and below a town
Confidence intervals for the ratio of binomial and multinomial proportions
Garment Latin square data from Littell et al. (2002)
Florida state death penalty data
Facebook performance metrics for data mining and machine learning
Mountain goat data from Yellowstone National Park
Ipomopsis fruit yield data
Calculates joint confidence intervals for parameters in linear models using a Bonferroni procedure.
Multiple pairwise comparison procedure to accompany a Friedman test.
Fire data from Yellowstone National Park
Visualize exponential power functions
Magnet pain relief data
ANOVA linear models
Gibbs sampling of normal hierarchical models
Interactive visualization of least squares regression.
Regression linear model derivation from linear algebra
Visualize random effects model
One sample t-test
Paik diagrams
Fisher's Rothamsted potato data
Multiple pairwise comparison procedure to accompany a Kruskal-Wallis test
Creates plots for one way ANCOVAs
Demonstration of regression mechanics
Conducts pairwise post hoc and planned comparisons associated with an ANOVA
Biweight midvariance, and biweight midcorrelation.
Polyamine data from Hollander and Wolfe (1999)
Visualize the sampling distribution of Pearson's product moment correlation
Interactive self-testing questions
One sample z-test
Plots a simple linear regression along with confidence and prediction intervals.
CO2 exchange time series data
American gizzard shad data
Visualize the Hardy Weinberg equilibrium
Plant traits for 136 species
Visualization of the M-estimation function
Portneuf River longitudinal N and P data
Power analysis for a one sample z-test
Plots confidence intervals and/or bars with letters indicating significant differences for objects from class pairw
Interactive depiction of precision and accuracy
Prostate cancer data
Transition matrix analysis
Trim data
Snoring and heart disease contingency data
SO2 data for 32 US cities with respect to 6 explanatory variables
Robust test for random factors using trimmed means.
prediction sum of squares
Matched pairs schizophrenia data
Visualize important non-linear functions
Refinery CO dataset
Perpendicularity
Scandinavian site by species community matrix
Jackknife standard error from a set of pseudovalues
Visualize ANCOVA mechanics
Robust one way trimmed means test.
Winsorize data
Animated representation of sampling distribution basics
Compilations of genus and species counts from Simberloff (1970)
Species richness and environmental variables from Mt Washburn
Sample skewness and kurtosis
White wine quality data for data mining
Random draws from a scaled inverse chi-square distribution
Population levels in various countries from 1980-2006
Interactive depiction of the ANOVA mechanism
Visualize pdfs
del14C in the atmosphere from 1700-1950
Interactive depiction of type I and type II error and power
Variance and standard error estimators for the sampling distribution of the sample mean
Depiction of the effect of random level selection on inferences concerning fixed effects
Salsify height dataset
DEM data from the Starkey experimental forest in NE Oregon
Mammalian BMR and biomass data from Savage et al. (2004)
Spider web length data
Whickham contingency table data for smokers and survivorship
Unbalanced and balanced linear models
Interactive worksheet for logical and fallacious arguments
Wildebeest carcass categorical data
Agricultural randomized block design
Interactive depiction of ROC curves
Interactive depiction of the multinomial distribution
Interactive smoother demonstrations
Shading functions for interpretation of pdf probabilities.
Visualize t-tests
GUI display of probability
Tukey's test of additivity.
Interactive depiction of type I and II error
Veneer data from Littell et al. (2002)
World CO2 levels, by country, from 1980 to 2006
Greenhouse gas emissions from Our World in Data
Agresti-Pendergrast test
Atmospheric carbon and D14C measurements
Bayesian graphical summaries for discrete or categorical data.
Barro Colorado Island Tree Counts
Tree presence/absence data from Barro Colorado island
Brunner-Dette-Munk test