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You should use this format with an if statement.

 

If Ladder_Rise <= 180 Then
	Parameter("Stringer_Width") = 2.5
ElseIf Ladder_Rise > 180 And Ladder_Rise <= 360 Then
	Parameter("Stringer_Width") = 3
ElseIf Ladder_Rise > 360 And Ladder_Rise <= 540 Then
	Parameter("Stringer_Width") = 3.5
ElseIf Ladder_Rise > 540 And Ladder_Rise <= 720 Then
	Parameter("Stringer_Width") = 4
End If

 

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