Measures of variability
Variance, standard deviation, and interquartile range
There are three primary measures of variability. Variability, as a statistical concept, is extremely important. Variance dictates the statistical power and statistical precision with which study results can be generalized. Standard deviation gives a relative context to observations in a distribution. And interquartile range plays a significant role in better understanding the effects of skewed distributions. Measures of variability are often reported concurrently with measures of central tendency like means and medians.
Three measures of variability
Click on a button below to continue.
Hire A Statistician
DO YOU NEED TO HIRE A STATISTICIAN?
Eric Heidel, Ph.D., PStat will provide the following statistical consulting services for undergraduate and graduate students at $100/hour. Secure checkout is available with Stripe, Venmo, Zelle, or PayPal.
- Statistical Analysis
- Research Design
- Sample Size Calculations
- Diagnostic Testing and Epidemiological Calculations
- Survey Design and Psychometrics
