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| width="150pt" | '''Calculation type'''

<li>The '''Variable Expression''' field specifies the expression that will be provided to the variable. Typically, this will be the value of a field in the report. To specify a field in the report edit the '''Variable Expression''' field.

[[Image:IReport VariableAdd5.png|center|500px|''Variable Expression Editor'']]<div align="center">''Variable Expression Editor''</div></li>

In addition to the summary functions available on the variable, specific expressions can be used in the Expression Editor to define values. For example:

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| width="150pt" | '''Operation'''

| Concatenation (string only)|| $F{localId} + $P{LocationName}

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==Crosstabs==