Calculators

Use this ANOVA calculator to perform one-way ANOVA and post hoc comparison tests. Use the classic F-test ANOVA when you can assume group variances are equal or Welch’s ANOVA when they are not equal. Enter your data in either Stacked (i.e., long format) or Unstacked (i.e., wide format). For stacked data, copy and paste and from spreadsheets and the rows will auto-expand to fit your dataset. Ensure that outcome data are in the first column and group information in the second. For unstacked data, you’ll need to specify the number of groups and paste each group’s data into separate boxes. Choose your ANOVA options  and click Analyze to generate the results. If you include the variable names in the header, they will appear in the results. [Read more…] about ANOVA Calculator

Use this median absolute deviation calculator to measure how much your data spread out from the median and find outliers. It finds the absolute median distance that data points fall from the median and values that are unusual far from the median. Just enter or paste your numbers in the data box, separated by commas, spaces, or line breaks. You can copy and paste from spreadsheets. Then click Calculate to see how much the values in your dataset differ from the median. [Read more…] about Median Absolute Deviation Calculator

Use this Outlier Calculator to find anomalous values in your dataset using multiple detection methods. Paste or type your numbers into the single input box—values can be separated by commas, spaces, or line breaks. Copy and pasting from a spreadsheet column is acceptable. Text is ignored. Click Analyze in the Outlier Calculator to find unusual values and to generate a results printout you can save or share. [Read more…] about Outlier Calculator

Use this percentage calculator to find various percentages. Simply enter both required values in a row and click Calculate! [Read more…] about Percentage Calculator

Use this Normality Test Calculator to determine whether a dataset is consistent with a normal distribution. Paste or type your numbers into the single input box—values can be separated by commas, spaces, or line breaks. Copy and pasting from a spreadsheet column is acceptable. Text is ignored. Click Analyze to compute core sample statistics (mean, median, standard deviation, range, skewness, and excess kurtosis), and to generate a results printout you can save or share. [Read more…] about Normality Test Calculator

Use this 2-sample median bootstrap test calculator to determine whether the difference between two medians is statistically significant. This calculator requires two independent samples and can use continuous or ordinal data. It calculates the p-value and constructs a confidence interval for the difference. Because this calculator evaluates medians, it is a solid choice for skewed data, outliers, and ordinal scales (e.g., Likert items). You can copy and paste your data or type it in, up to 2000 rows. The editable headers are used in the results.
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Use this Empirical Rule Calculator to quickly determine the ranges where most values lie in a normal distribution. Using the 68-95-99.7 rule, it calculates the intervals within one, two, and three standard deviations from the mean. Simply enter the population mean and standard deviation, and the calculator shows the corresponding ranges where 68%, 95%, and 99.7% of the data are expected to fall. [Read more…] about Empirical Rule Calculator

Use this Normal Distribution Calculator to find probabilities and visualize areas under the normal curve. In the calculator, enter an Observed Value (X), Population Mean (μ), and Standard Deviation (σ). It displays the probability that a value is less than X, greater than X, between the mean and X, within a symmetric range around the mean, and outside that range. The calculator also includes clear, shaded graphs for each probability and a step-by-step breakdown of the z-score calculation. [Read more…] about Normal Distribution Calculator

Use this linear regression calculator to analyze the relationship between two variables using simple linear, quadratic, or cubic models. It finds and graphs the best-fit line, displays the regression equation, and provides key model statistics. Enter your paired data in the spreadsheet-style table—either manually or by pasting multiple cells from a spreadsheet. Ensure that the first column contains the dependent variable (Y) and the second column is the independent variable (X). The table can handle up to 300 rows and will expand automatically when you paste in the data. Choose your regression model and click Analyze to generate the results. If you include the variable names in the header, they will appear in the results. [Read more…] about Linear Regression Calculator

Use this negative binomial distribution calculator to find the probability of needing a specific number of trials to achieve a set number of events. Enter the event probability (p), the number of events (r), and the total number of trials (X). For example, this negative binomial distribution calculator can tell you the probability that you will get 8 heads in 10 coin tosses when the probability of each head is 0.5. [Read more…] about Negative Binomial Distribution Calculator

Use this geometric distribution calculator to find the probability of getting the first success on a specific trial in a sequence of independent Bernoulli trials. Enter the probability of success (p) and the number of trials (x) where the first success occurs. You can choose whether the value of x includes the success trial or only counts the failures before the first success. For example, this geometric distribution calculator can determine the probability that your first successful outcome happens on the fourth attempt, given a 20% chance of success each time. [Read more…] about Geometric Distribution Calculator

Use this hypergeometric distribution calculator to find the probability of drawing a specific number of successes in a sample taken from a finite population without replacement. Enter the population size (N), the number of successes in the population (K), the sample size (n), and the number of observed successes in the sample (k). For example, this hypergeometric distribution calculator can tell you the probability of getting 3 red marbles when drawing 5 from a jar containing 10 red marbles and 30 blue marbles. [Read more…] about Hypergeometric Distribution Calculator

Use this weighted average calculator to find the weighted mean when different values in your dataset carry different levels of importance. Enter your values and their corresponding weights in the table, either by typing directly or pasting from a spreadsheet. You can have up to 300 rows and the table will automatically expand when pasting. Click Calculate to see the weighted average based on your data. [Read more…] about Weighted Average Calculator

Use this standard error calculator to find the standard error of the mean (SEM) for your data. Just enter or paste your values in the data box, separated by commas or spaces, and click Calculate. You can copy and paste from a spreadsheet. This tool works with sample data and automatically computes the sample standard deviation and the standard error for your dataset. [Read more…] about Standard Error Calculator

Use this mean absolute deviation calculator to measure how much your data spread out from the mean. Just enter or paste your numbers in the data box, separated by commas, spaces, or line breaks. You can copy and paste from spreadsheets. Then click Calculate to see how much the values in your dataset differ from the average. [Read more…] about Mean Absolute Deviation Calculator

Use this Critical Value Calculator to find the critical values for common statistical tests. This calculator supports Z, t, chi-square (χ²), and F-distributions. To use it, select your test statistic distribution from the dropdown menu. Then, enter the degrees of freedom if required and choose your significance level. Click Calculate to find the critical value(s) for your test. [Read more…] about Critical Value Calculator

Use this P-value calculator to compute exact tail probabilities for common test statistics. This calculator supports Z-scores, t-scores, chi-square (χ²), and F-scores. To use it, select your test statistic from the dropdown menu. Then, enter your degrees of freedom (if required) and observed test statistic value. Click Calculate to see the result. [Read more…] about P-Value Calculator

Use this T Test Calculator to perform a 1-sample, 2-sample, or paired t-test and assess your sample means. All these t-test calculator will find p-values and construction confidence intervals. Just scroll down to find the t-test you need and click to expand it. Simply enter your data into the table. Or copy and paste from a spreadsheet and the table will add rows as needed. You can enter up to 300 data rows, and the calculator automatically ignores incomplete or invalid rows. The editable headers are used in the statistical results. [Read more…] about T Test Calculator

Use this chi-square calculator to test relationships between categorical variables. It computes the Pearson’s chi-square statistic by comparing your observed counts to the values you would expect if there were no association between categories. The results include the overall χ² value, degrees of freedom, p-value, and an APA-style results format for publications. [Read more…] about Chi-Square Calculator

Use this percentile calculator to find a specific percentile in your dataset and its quartiles. It also displays a table with the 10th, 25th, 50th, 75th, and 90th percentiles so you can gauge your data’s distribution at a glance. [Read more…] about Percentile Calculator