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I am defining a parameter for a python script in model builder. The script calculates a single value from a featureclass using a formular referencing values of a long integer field in the same table. This value will be used as a variable for another tool in the model which is defined as a short integer. I therefore need to set the parameter in the script setting to "output" so that I can use the variable elsewhere and set the data type. Which data type should I use for small integers?

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I would use Long (derived). This will be automatically stored in your field as a short integer if the absolute value is small enough (< 32767), but this will be an issue when its larger, so make sure that your model handles the case when the user enters a value that will yield an "out of range" output.

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