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Parameters define sets of values which can be used in your questions. A parameter can easily define hundreds or thousands of possible values. References allow you to access the possible values individually instead of randomly.


For example, if you define this parameter:




$p will take on a random value in the range and there are nearly 1000 possible values it could take. If you want specify one particular value you can use a reference.




The 200 is the reference and allows you to specify one particular possible value.