May's effective specialization index
Doornik-Hansen test for multivariate normality.
Simple functions for MCMC demonstrations
Tree presence/absence data from Barro Colorado island
Maximum likelihood algorithm for determining the binomial dispersal coefficient
Agresti-Pendergrast test
Calculation and display of concordant and discordant pairs
Mahalanobis distance for two sites using a pooled covariance matrix
Barro Colorado Island Tree Counts
Brunner-Dette-Munk test
Soil potassium analyses from 8 laboratories
Calculates kappa statistic and other classification error statistics
Kullback test for equal covariance matrices.
Monte Carlo hypothesis testing for two samples.
Geometric mean
Bayesian graphical summaries for discrete or categorical data.
Atmospheric carbon and D14C measurements
Harmonic mean
Hodges-Lehman estimator of location
Sample mode
Mack-Skillings test
Animated demonstration of frequentist binomial convergence of probability using a coin flip.
Glucose Levels Following Alcohol Ingestion
Preston diversity analysis
Animated demonstration of density for a continuous pdf
CSIRO d13C-CO2 data from Rubino et al., A revised 1000 year atmospheric 13C-CO2 record from Law Dome and South Pole, Antarctica
Animated depiction of six-sided die throws.
Animated depictions of Lotka-Volterra competition and exploitation models
Alpine soil temperature and moisture time series
Animated depictions of population growth
Baby walking times experimental data
Bat forearm length as a function of bat age
Animation demonstrations of confidence intervals.
Functions for calculating alpha diversity.
Animated depiction of experimental designs
Barplots with error bars (including interval plots)
Bombus pollen data.
Split plot computer chip data from Littell et al. (2006)
Bromus tectorum dataset
Dataset of salary attributes for male and female workers from Ramsey and Schafer (1997)
Anscombe's quartet
Fern environmental sex determination data
Chi plots for diagnosing multivariate independence.
Enzymatic rate data for the phospholipase protein ExoU
R hat MCMC convergence statistic
PCBs and herring egg thickness
Aids and veterans dataset
An agricultural split plot design
Bone development data
Ant honeydew data
Animated demonstration of randomized sampling designs
Repeated measures data for an exercise experiment.
Wood boring beetle data.
Venn probability diagrams for an event with two outcomes
Anolis lizard contingency table data
Agricultural factorial design
PM 2.5 pollutant data from Pocatello Idaho.
Pulldown menus for 'asbio' interactive graphical functions
Conversion of binary digits to decimal numbers
Confidence interval for the product of two proportions
Heart rate data from Milliken and Johnson (2009)
Animated plots of log-likelihood functions
Caribou count data
Huber M-estimator iterative least squares algorithm
Confidence interval for the median
Huber M-estimator of location
Animated plot of least squares function.
Confidence intervals for ratios of proportions when the denominator is known
Loess 2D and 3D smooth plots
Bootstrap CI of M-estimators differences of two samples
Agrostis variabilis cover measurements
Animated plot of the least squares function.
Dataset of mammal traits from Ramsey and Schaefer (1997)
Magnet pain relief data
Multiple pairwise comparison procedure to accompany a Kruskal-Wallis test
Confidence interval estimation for the binomial parameter pi using five popular methods.
Animation of Markov Chain Monte Carlo walks in bivariate normal space
Bayesian linear models with uniform priors
Asthma repeated measures dataset from Littell et al. (2002)
Welch tests controlled for simultaneous inference
Portneuf River longitudinal N and P data
Area under a receiver operating characteristic (ROC) curve
Z and t confidence intervals for mu.
Grizzly bear litter sizes
One sided confidence interval for mu.
Confidence interval for sigma squared.
Potash/cotton strength data
Bivariate boxplots
Agresti crabs dataset
Confidence intervals for the ratio of binomial and multinomial proportions
Confidence intervals for stratified random samples.
Make plots of bivariate normal distributions
Environmental data for the community dataset cliff.sp
Hamilton depression scores before and after drug treatment
Tippett cuckoo egg data
Random draws from a scaled inverse chi-square distribution
A simple function for bootstrapping
Chronic ailment counts for urban and rural women in Australia
Garment Latin square data from Littell et al. (2002)
A multivariate normal dataset for data mining
Angle of azimuth to a boundary.
Demonstration of regression mechanics
Contingency data for high school marijuana, alcohol, and cigarette use
Mule deer telemetry data
Mountain goat data from Yellowstone National Park
Yellowstone NP cliff community data
Huber one step M-estimator
Bootstrap confidence intervals
Corn yield data
Visual illusions illustrating human perception errors.
Interactive depiction of ROC curves
Interactive depiction of type I and II error
Maternal deer data
Interactive self-testing statistical questions
Gibbs sampling of normal hierarchical models
crab gill and body weight data
Trim data
Modified Levene's test
Fly sex and longevity
Concrete strength dataset for data mining
Fruit weight data from Littell et al. (2002)
Esophageal cancer data modified slightly to create a balanced three-way
factorial design
Dissolved levels in locations above and below a town
Partial residual plots for interpretation of multiple regression.
Australian frog calls following fire
Kaplan-Meier survivorship.
Florida state death penalty data
Facebook performance metrics for data mining and machine learning
Fire data from Yellowstone National Park
Permutation test for two and three way factorial designs
Robust test for random factors using trimmed means.
Likelihood ratio test for tabular data
Creosote bush counts
Mouse life expectancy data
Mosquito wing length data
Ipomopsis fruit yield data
Plots confidence intervals and/or bars with letters indicating significant differences for objects from class pairw
Creates plots for one way ANCOVAs
AIC, AICc, BIC, Mallow's Cp, and PRESS evaluation of linear models
Mountain island biogeographic data
Datasets for resource use and availability
Patient responses to myeloma drug treatments
Functions for customizing correlation matrices
Calculates joint confidence intervals for parameters in linear models using a Bonferroni procedure.
Efficiency of a randomized block design compared to a CRD
One sample z-test
Agricultural randomized block design
Visualize the sampling distribution of Pearson's product moment correlation
Paik diagrams
Normal quantile plots for single or multiple factor levels
Plots a simple linear regression along with confidence and prediction intervals.
Percentage bend correlation
Partial correlations of determination in multiple regression
Nearest neighbor boundary coordinates
Animated and/or snapshot representations of a statistic's sampling distribution
Animated representation of sampling distribution basics
Interactive depiction of the ANOVA mechanism
Whickham contingency table data for smokers and survivorship
Biweight midvariance, and biweight midcorrelation.
Fisher's Rothamsted potato data
Power analysis for a one sample z-test
Mammalian BMR and biomass data from Savage et al. (2004)
prediction sum of squares
One sample t-test
Conducts pairwise post hoc and planned comparisons associated with an ANOVA
Prostate cancer data
Polyamine data from Hollander and Wolfe (1999)
Rat glycogen data from Sokal and Rohlf (2012)
Depict the effect of range on correlation
Multiple pairwise comparison procedure to accompany a Friedman test.
Refinery CO dataset
Nitrogen content of soils under pika haypiles
Interactive depiction of type I and type II error and power
Visualize random effects model
Visualize exponential power functions
Veneer data from Littell et al. (2002)
Scandinavian site by species community matrix
White wine quality data for data mining
Plant traits for 136 species
Matched pairs schizophrenia data
Perpendicularity
ANOVA linear models
Visualize important non-linear functions
Visualize the Hardy Weinberg equilibrium
Visualize pdfs
SO2 data for 32 US cities with respect to 6 explanatory variables
World CO2 levels, by country, from 1980 to 2006
Interactive depiction of precision and accuracy
Jacknife pseudo-values
Visualization of the M-estimation function
Jackknife standard error from a set of pseudovalues
Regression linear model derivation from linear algebra
CO2 exchange time series data
Unbalanced and balanced linear models
Interactive smoother demonstrations
Visualize t-tests
Variance and standard error estimators for the sampling distribution of the sample mean
GUI display of probability
Compilations of genus and species counts from Simberloff (1970)
Visualize ANCOVA mechanics
Robust one way trimmed means test.
DEM data from the Starkey experimental forest in NE Oregon
del14C in the atmosphere from 1700-1950
Population levels in various countries from 1980-2006
Sample skewness and kurtosis
Interactive worksheet for logical and fallacious arguments
Tukey's test of additivity.
Wildebeest carcass categorical data
Depiction of the effect of random level selection on inferences concerning fixed effects
Winsorize data
Interactive depiction of the multinomial distribution
Interactive visualization of least squares regression.
American gizzard shad data
Shading functions for interpretation of pdf probabilities.
Salsify height dataset
Transition matrix analysis
Species richness and environmental variables from Mt Washburn
Snoring and heart disease contingency data
Spider web length data