How to Use the Power BI DAX function T.DIST

What is the T.DIST Function?

The T.DIST function is a statistical function that calculates the cumulative distribution function (CDF) of the Student’s t-distribution. The t-distribution is a probability distribution that is used to estimate the mean of a population when the sample size is small or when the population’s variance is unknown.

The T.DIST function takes two arguments: x and degrees_freedom. The x argument is the value at which you want to evaluate the CDF, and the degrees_freedom argument is the number of degrees of freedom for the t-distribution.

Using the T.DIST Function in Power BI

To use the T.DIST function in Power BI, you need to follow these steps:

1. Open a new or existing report in Power BI Desktop.

2. Go to the formula bar and start typing the T.DIST function.

3. Enter the x and degrees_freedom arguments separated by a comma.

4. Close the function with a parenthesis and hit Enter to evaluate the function.

Here is an example of how to use the T.DIST function to calculate the CDF of a t-distribution with 10 degrees of freedom at the value of 2:


The TRUE argument at the end of the function specifies that we want to calculate the cumulative distribution function. If we set it to FALSE, we would get the probability density function instead.

Understanding the Output of the T.DIST Function

The output of the T.DIST function is a number between 0 and 1, which represents the probability that a random variable from the t-distribution is less than or equal to the value of x. For example, if the output is 0.95, it means that there is a 95% chance that a random variable from the t-distribution is less than or equal to the value of x.

The T.DIST function is a useful tool for calculating the CDF of the t-distribution in Power BI. By understanding how to use this function, you can gain insights into the probability distribution of your data and make informed decisions based on the results. Whether you are a data analyst, a business owner, or a student, mastering the T.DIST function can help you make sense of your data and achieve your goals.

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