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• Area of a triangle

  This is univeral online calculator for the area of a triangle which uses different methods to find the area of a triangle, depending on your knowledge of the triangle.

• Centered Moving Average

  This online calculator calculates centered moving average, which is used instead of moving average then number of periods is even

• Covariance Calculator

  This online calculator computes covariance between two discrete random variables

• Equation of a circle passing through 3 given points

  This online calculator finds equation of a circle passing through 3 given points

• Equations of a circle with given center and radius in different forms

  This online calculator displays equations of a circle in standard form, in parametric form and in general form given center and radius of a circle

• Estimated Mean of a Population

  This online calculator allows you to estimate mean of a population using given sample

• Lagged scatterplot

  This online calculator builds scatterplot of the time series against itself offset in time

• Line equation from two points

  This online calculator finds the equation of a line given two points it passes through, in slope-intercept and parametric forms

• Mean, variance and standard deviation of discrete random variable

  This online calculator calculates mean, variance and standard deviation of random variable entered in the form of value-probability table

• Noisy function generator

  This online calculator takes function, calculates its values for given range and then adds some random noise to distort original values.

• P-value

  This online calculator calculates p-value for one sided and two sided tests given the z-score

• Probability Urn simulator

  This calculator simulates urn or box with colored balls often used for probability problems and can calculate probabilities of different events.

• Quick Sum Calculator

  This online calculator sums up entered integer numbers. Any symbol what is not a digit, for example, a space, a comma, a semicolon, etc, serves as a separator. It is useful when you need to sum up several numbers but do not have speadsheet program at hand.

• Random combination of numbers from specified range

  This calculator randomly picks several numbers from specified range.

• Time Series Decomposition

  This online calculator decomposes time series by extracting seasonality and trend from data

• Tips and tricks #10: Dynamic table columns

  This article describes how to work with dynamic columns in your calculator

• Tips and tricks #8: How to reuse existing calculator

  This article describes process of reusing another calculator's logic (algorithm) in your calculator.

• Tips and tricks #9: Big numbers

  How to use big number input and PCR library.

• Z-score / Standard score

  This online calculator computes the standard score of a raw score from the given mean of the population and the standard deviation of the population.

• 3d coordinate systems

  Transforms 3d coordinate from / to Cartesian, Cylindrical and Spherical coordinate systems.