A re-read confirms that you are correct. So, minor correction to
If Cells(lr, i) < 0.9 * Cells(lr - 1, i) Then Cells(lr, i).Clear
--
Don Guillett
Microsoft MVP Excel
SalesAid Software

"Dave Thomas" wrote in message
. net...

"Dave Thomas" wrote in message
. net...
Don, am I not understanding the code? Is the code saying to compare the
value before the last value found in the column and if the value before
the last value found is less than 90% of the last value found, delete the
last value found? If the code is saying that, the code is wrong. He
wants to delete the last value found only if it less than 90% of the
penultimate value which is the value before the last value found. For
example: if the last value found is in C101 the penultimate value is
therefore in C100. If C101 is less than 90% of C100 then delete the value
in C101. Your code is saying, if I understand it, that if C100 is less
than 90% of C101, delete the value in C101. I think we have a failure to
communicate here because of the word penultimate which means "next to
last".

"Don Guillett" wrote in message
...
Use this

Sub deletelastiflessthan90()
lc = Cells.Find(what:="*", _
after:=Cells(1, 1), searchorder:=xlByColumns, _
searchdirection:=xlPrevious).Column
For i = 1 To lc
lr = Cells(Rows.Count, i).End(xlUp).Row
'MsgBox lr
If Cells(lr - 1, i) < 0.9 * Cells(lr, i) Then Cells(lr, i).Clear
Next i
End Sub

--
Don Guillett
Microsoft MVP Excel
SalesAid Software

"z.entropic" wrote in message
...
Yes, Dave, that's my intent, to delete the last value only and only if
it is
LESS than 90% of the penultimate value, including "0", which crashes
the
calcs.

z.entropic

"Dave Thomas" wrote:

He wants to delete the last value only if it's less than 90% of the
penultimate value. Your macro is deleting the last value if it's
greater
than 90% of the penultimate value. The code should be: If
ActiveCell.Value <
(ActiveCell.Offset(-1, 0).Value * 0.9) Then ActiveCell.Value = ""


"Mike H" wrote in message
...
try

Sub marine()
Dim LastColumn As Long
With ActiveSheet
LastColumn =
.Range("A1").SpecialCells(xlCellTypeLastCell).Colu mn
End With
For x = 1 To LastColumn
Columns(x).Select
ActiveCell.Offset(65535, 0).End(xlUp).Select
If ActiveCell.Value (ActiveCell.Offset(-1, 0).Value * 0.9) Then
_
ActiveCell.Value = ""
Next
End Sub

Right ckick sheet tab view code and paste in

Mike

"Don Guillett" wrote:

Be careful about running this twice.

Sub deletelastiflessthan90()
For i = 1 To 36' chg to suit
lr = Cells(Rows.Count, i).End(xlUp).Row
If Cells(lr - 1, i) < 0.9 * Cells(lr, i) Then Cells(lr, i).Clear
Next i
End Sub

--
Don Guillett
Microsoft MVP Excel
SalesAid Software

"z.entropic" wrote in message
...
My worksheets have dozens of columns, each with up to a few
thousand
rows.
Both enumber of columns and rows varies from one data set tp
another.

I'd like to have a macro that would delete the last value in each
column,
but only if it's less than 90% of the penultimate value in that
column.

Obviously, simply recording a macro with a Ctrl-Down key sequence
in
each
column will not work as the the last value is recorded as a
static
address,
but maybe using the OFFSET function would...

Help, please...

z.entropic