[header] How to calculate the expected value of sample information (evsi ) [title] Calculate the expected monetary value (emv) of each alternative action. [step] Note which is the emv * (greatest value). [title] Determine the likelihood probabilities. 
[step] These may be given to you, or you may need to calculate them. If you need to calculate them, look at the type of experiment being done as this will lead you into how to calculate the probabilities.