Calculate variance from combined rows with nested loop for all columns (VBA)

[anatomyst]

I have started to use VBA and I have the following problem. I want to calculate the variance of the 6th and 9th row. Then, 6th and 12th row (yellow).

The loop should then calculate the 7th and 10th and 7th and 13th row (beige) Finally, the loop should then calculate the 8th and 11th row, 8th and 14th row (orange). Then the first block ends.

The next block should be calculated according to the same principle (red). The Variance should be calculated for columns from a-o. In the end I'll receive the results.

I do not know how to go through it column by column and combined row by row. I would be very grateful for any advice.

 

[anatomyst]

Sub test3()
Dim sh As Worksheet, rng As Range, lRow As Long, LCol As Long
Dim r As Integer, c As Integer

Set sh = Sheets("Tabelle6")

LCol = sh.Cells(8, Columns.Count).End(xlToLeft).Column
lRow = sh.Cells(rows.Count, "A").End(xlUp).row

Set rng = sh.Range(sh.Cells(lRow + 2, "A"), sh.Cells(lRow + 2, LCol))

For r = 6 To lRow Step 9
With rng
'.Formula = "=VAR.P(A6:A" & lRow & ")"
.Formula = "=VAR.P((IF(MOD(ROW(A6:A" & lRow & ")-ROW(A6)+0,3)=0,A6:A" & lRow & "))"

  .value = .value
End With
Next

With rng.Borders(xlEdgeTop)
  .LineStyle = xlContinuous
  .Weight = xlThick
End With


End Sub