34 tools
Statistics
Averages, spread, correlation and the tests that say whether a difference is real — each one showing the numbers it rests on.
Tools in this category
- StatisticsAverage CalculatorPaste a list of numbers and get the mean, median, sum, count, minimum, maximum and range.
- StatisticsWeighted Average CalculatorAverage a list of values where each one carries a different weight or coefficient.
- StatisticsStandard Deviation CalculatorHow spread out a set of numbers is, with the subtraction and the squaring laid out line by line.
- StatisticsT-Test CalculatorWhether the difference between two sets of numbers is bigger than chance would produce, with the p value and the size of the difference.
- StatisticsLinear Regression CalculatorThe straight line that fits a set of points best, with the equation, how much it explains, and a prediction.
- StatisticsMargin of Error CalculatorThe proportion your sample found, the margin of error around it, and the interval that follows — with the finite population correction when it applies.
- StatisticsCorrelation CalculatorHow closely two sets of numbers move together, by Pearson and by rank, with a confidence interval around the answer.
- StatisticsProbability CalculatorThe chance of both, either, neither or exactly one of two independent events.
- StatisticsQuartile CalculatorThe median, the quartiles, the interquartile range and the values Tukey's rule flags as outliers.
- StatisticsBayes' Theorem CalculatorWhat a positive result really means, once the rarity of the thing being tested for is taken into account.
- StatisticsChi-Square CalculatorWhether counts differ from what you expected, or whether two categories are related, with the p value and the strength of the link.
- StatisticsCombinations and Permutations CalculatorHow many ways k items can be chosen from n, with and without counting the order.
- StatisticsMean, Median and Mode CalculatorThe three averages of a set of numbers, plus the range and the count.
- StatisticsANOVA CalculatorWhether three or more groups really differ, by comparing the variation between them against the variation inside them.
- StatisticsMoving Average CalculatorSmooth a bumpy series of numbers by averaging each value with the ones before it, and see where the trend is heading.
- StatisticsStatistical Power CalculatorWhether your study is big enough to find the difference you are looking for, and how many people it would take.
- StatisticsSkewness and Kurtosis CalculatorWhich way a distribution leans and how heavy its tails are, with the standard errors that say whether either is real.
- StatisticsPermutations with Repetition CalculatorHow many arrangements are possible when things can repeat, or when the set you are rearranging already contains duplicates.
- StatisticsCoefficient of Variation CalculatorSpread as a percentage of the mean, so two things measured on different scales can be compared for variability.
- StatisticsDice Probability CalculatorChance of rolling at least one chosen face, the expected total, and the odds of all dice matching.
- StatisticsStratified Sampling CalculatorHow many people to draw from each group so that the sample mirrors the population, with the rounding handled properly.
- StatisticsBirthday Problem CalculatorChance that two of a group share a value, with the number of pairs and the group size for even odds.
- StatisticsConfidence Interval CalculatorMargin of error and confidence interval for a sample mean, with the standard error and the sample size for half the margin.
- StatisticsNormal Distribution Probability CalculatorProbability below, above and within a value on a normal curve, with the z-score and the odds of exceeding it.
- StatisticsSample Size CalculatorSample size for a survey or inspection at a chosen confidence level and margin of error.
- StatisticsProbability of At Least One CalculatorChance that an event happens at least once over repeated independent tries, with the tries needed for even odds.
- StatisticsOdds to Probability CalculatorImplied probability from odds, in decimal and fractional form, with the return on a stake.
- StatisticsZ-Score CalculatorHow many standard deviations a value sits from the mean.
- StatisticsExpected Value CalculatorExpected value of three possible outcomes, with the variance and standard deviation of the result.
- StatisticsPoisson Distribution CalculatorProbability of exactly k events, of none, and of at least one, when the average rate is known.
- StatisticsBinomial Probability CalculatorProbability of exactly k successes in n independent trials, with the expected value.
- StatisticsSample Size for Comparing Two ProportionsHow many people you need in each group to detect a difference between two rates.
- StatisticsSample Size for Comparing Two MeansHow many subjects you need per group to detect a given difference between two averages.
- StatisticsHypergeometric Probability CalculatorOdds of drawing a given number of the right things, when you draw without putting them back.