Prob Distributions
Normal, binomial, Poisson, and more: PDF/PMF, CDF, quantiles, shaded intervals, and sample fitting.
About this tool
Probability distributions: PDF / PMF, CDF, inverse CDF (quantile), shaded one-sided / two-sided intervals, and simple sample fitting.
Distributions
Normal, Student-t, Poisson, Binomial, Chi², F, Gamma, Beta, Uniform, Exponential, Lognormal, Weibull and Geometric.
Intervals
- two-sided central: e.g. Normal(0,1), q=0.95 gives about -1.96..1.96.
- lower / upper tail: one-sided cutoffs.
- between a and b: direct integral / sum between two x-axis bounds.
Fitting
Paste sample data and press Fit from data. Fits are quick method-of-moments / plug-in estimates, good for exploration, not formal inference.