Quick question for you Excel-Looping-Experts out there€¦

Today I was working with a relatively simple Do Until€¦Loop. I got stuck, so
I turned on the Macro Recorded and got a couple of lines of code from that.
My code is below€¦


Sub Compare_AB()
Dim i, j As Integer
Range("A1").Select
i = ActiveCell.Value
Range("B1").Select
j = ActiveCell.Value

Do Until ActiveCell = ""
If i = j Then
Selection.Offset(0, 2).Select

ActiveCell.FormulaR1C1 = "=IF(RC[-3]=RC[-2],""Yes"",""No"")"

End If

Selection.Offset(1, 0).Select
Selection.Offset(0, -2).Select


Loop
End Sub


Yes, I know this is not very eloquent, but it actually works exactly like I
want it to (basically, it compares values in Column A with values in Column
B; if the two match, a €œYes€� is placed in Column D, but if they dont match a
€œNo€� is placed in column D). Now, my question is two fold:

1) How can I make the code more efficient (i.e., get rid of the
ActiveCell.FormulaR1C1 = "=IF(RC[-3]=RC[-2],""Yes"",""No"")" and
Selection.Offset(1, 0).Select and Selection.Offset(0, -2).Select)?

2) The code below simply places a €œYes€� in Column D, seemingly without
evaluating the values in Column A and Column B. Why does the code below not
evaluate all of the elements in Column A and Column B?

Sub Compare_AB()
Dim i, j As Integer
Range("A1").Select
i = ActiveCell.Value
Range("B1").Select
j = ActiveCell.Value
Do Until ActiveCell = ""
If i = j Then
Selection.Offset(0, 2).Select

ActiveCell.Value = "Yes"

If i < j Then
ActiveCell.Value = "No"

End If
End If

Selection.Offset(1, 0).Select
Selection.Offset(0, -2).Select


Loop
End Sub


Thanks for your time and effort!!

--
RyGuy