Statistics Calculator
Calculate descriptive statistics, correlation, regression, and z-scores
Data Input
Enter your data separated by commas
Statistics Results
Your calculated statistics
About Statistical Calculations
Descriptive Statistics
- • Mean: Average of all values
- • Median: Middle value when sorted
- • Mode: Most frequently occurring value
- • Standard Deviation: Measure of data spread
- • Quartiles: Values that divide data into quarters
Correlation & Regression
- • Correlation: Strength of linear relationship (-1 to 1)
- • Regression: Best fit line through data points
- • R²: Proportion of variance explained by the model
- • Z-Score: How many standard deviations from the mean
Interpretation Tips
- • Correlation does not imply causation
- • Outliers can significantly affect statistics
- • Larger sample sizes provide more reliable results
- • Consider the context when interpreting results
Frequently Asked Questions
What is the difference between mean, median, and mode?▾
Mean is the arithmetic average. Median is the middle value when the data is sorted. Mode is the most frequently occurring value. Each captures a different sense of "typical."
What does standard deviation tell you?▾
Standard deviation measures how spread out values are from the mean. A small value means data points cluster closely around the mean; a large value indicates wide variation.
What is a z-score?▾
A z-score expresses how many standard deviations a value is from the mean. A z-score of 2 means the value is 2 standard deviations above average.
What is correlation?▾
Correlation measures the strength and direction of a linear relationship between two variables. Values range from −1 (perfect negative) to +1 (perfect positive), with 0 meaning no linear relationship.