Calculate Standard Deviation in Mendix - Mendix Forum

# Calculate Standard Deviation in Mendix

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Mendix is a low-code development platform that allows users to create custom business applications, but it doesn't have built-in functions for calculating standard deviation. However, you can use JavaScript in Mendix to calculate standard deviation. Here's how:

1. Create a new JavaScript action in your Mendix application.
2. Define the input parameter(s) for the action. For example, you might want to pass in an array of numbers to calculate the standard deviation of.
3. In the JavaScript code, calculate the mean of the input data by summing up all the values and dividing by the total count of values.
4. Calculate the variance by summing up the square of the difference between each value and the mean, and dividing by the total count of values.
5. Take the square root of the variance to get the standard deviation.
6. Return the standard deviation as the output of the JavaScript action.

Here's a sample JavaScript code to calculate the standard deviation in Mendix:

// Define the input parameter(s)
const inputData = input.data1;

// Calculate the mean
const mean = inputData.reduce((acc, val) => acc + val, 0) / inputData.length;

// Calculate the variance
const variance = inputData.reduce((acc, val) => acc + Math.pow(val - mean, 2), 0) / inputData.length;

// Calculate the standard deviation
const standardDeviation = Math.sqrt(variance);

// Return the standard deviation as the output of the action
output = { result: standardDeviation };

In this code, `input.data1` represents an array of numbers passed in as input to the JavaScript action. The output is returned as an object with the `result` property containing the calculated standard deviation.