Ma macro est commencée mais pas le code pour effectuer le calcul

Private Sub Select_region_Change()

End Sub

Private Sub UserForm_Initialize()
Dim j As Integer, i As Integer
Dim temp()
Select_region.Clear
derLi = Sheets("base").Range("F1000").End(xlUp).Row
i = 1
ReDim temp(1 To derLi)
With Sheets("base")
For j = 3 To derLi
If IsError(Application.Match(.Cells(j, 6), temp, 0)) Then
temp(i) = .Cells(j, 6)
i = i + 1
End If
Next j
End With
Select_region.List = temp
End Sub