Take a look at the image below to see how to do this in Microsoft Excel. Now, you need to raise your combined standard uncertainty to the power of 4. Raise the combined uncertainty to the power of 4 Look at the image below to see how to do it.Ĥ. You can easily do this in MS Excel using the summation (i.e. In this step, you want to add together all of your results from the previous step. Take a look at the image below to see how to perform this in MS Excel.ģ. The second step you will take is to divide your previous result by it’s associated degrees of freedom. Divide each uncertainty by it’s associated degrees of freedom Note 1: Power of 4 means that you will multiply the uncertainty component value by itself four times or use an exponent of 4.Ģ. After you finish raising the first uncertainty component to the power of 4, copy and paste the function for the remaining uncertainty components. Take a look at the image below for the formula in MS Excel. The first thing that want to do is raise each standard uncertainty component to the power of 4. Raise each uncertainty component to the power of 4 1 How to Calculate the Effective Degrees of FreedomĬalculating the effective degrees of freedom with the Welch Satterthwaite equation can look confusing, so I am going to break the process down into easy to follow steps for you.ġ. Otherwise, check out the next section to learn how to calculate the effective degrees of freedom step by step using Microsoft Excel. Plug the values into the equation and calculate the effective degrees of freedom. Each box is identified by color and symbol. Using the equation given above and the table pictured below, you can see how to easily apply the equation to your uncertainty calculations. Training – get online training that teaches you how to estimate uncertainty.
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