Calculators
Create and discover interactive calculators for various scenarios and measurements.
Inverse Normal Distribution Calculator
Finds the Z-score corresponding to a given cumulative probability (percentile) on a normal distribution.
T-Test Calculator
Performs a t-test (one-sample, two-sample, or paired) to compare means and determine statistical significance.
Standard Error Calculator
Calculates the standard error, which measures the accuracy with which a sample represents a population. It's commonly used for the standard error of the mean (SEM) and the standard error of the proportion.
Outlier Calculator
Identifies potential outliers in a dataset using the IQR * 1.5 rule (calculating fences).
Chi-Square Calculator
Calculates the Chi-Square statistic and p-value for goodness-of-fit or test of independence. It requires observed and expected frequencies or values.
Accuracy Calculator
Calculates the accuracy of a classification model based on True Positives (TP), True Negatives (TN), False Positives (FP), and False Negatives (FN). Accuracy is the proportion of correct predictions over the total number of predictions.
P-value Calculator
Calculates the probability of observing a test statistic as extreme as, or more extreme than, the one calculated, assuming the null hypothesis is true.
Pooled Standard Deviation Calculator
Calculates the pooled standard deviation, an estimate of the standard deviation for two samples assuming equal variance, often used in two-sample t-tests.
Sample Size Calculator
Estimates the minimum sample size required to achieve a desired level of confidence and margin of error for a study.
Coefficient of Determination (R-squared) Calculator
Calculates the proportion of the variance in the dependent variable that is predictable from the independent variable(s) in a regression.