References

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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=range(1,100,0.1)

 

$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.

 

$p[200]

 

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