Public Function DPersent(strNameFields As String, strNameTBL As String, Optional strFilter As String = "", Optional p As Integer) As Variant
'ôóíêöèÿ âû÷èñëåíèÿ ïåðñåíòèëè
'èñïîëüçîâàíèå àíàëîãè÷íî DCount,DMax è ò.ï.
'strNameFields - èìÿ ïîëÿ ñ äàííûìè
'strNameTBL - íàçâàíèå òàáëèöû èëè ñîõðàíåííîãî çàïðîñà
'strFilter - ñòðîêà ôèëüòðà
'p - çíà÷åíèå ïåðñåíòèëè â èíòåðâàëå 0-100
'strFilter = "CODE"
strNameTBL = "tbl_pdv"
strNameFields = "VALUE"
p = 90

Dim rst As ADODB.Recordset
Dim lngCount As Long
Dim k, part, x1, x2 As Double

On Error GoTo Err_dPersent

    lngCount = Nz(DCount("*", strNameTBL, strFilter), 0)
    If lngCount = 0 Then DPersent = Null: Exit Function

    Set rst = New ADODB.Recordset
    rst.Open "select " & strNameFields & " from " & strNameTBL & IIf(strFilter = "", "", " where " & strFilter) & " order by " & strNameFields, CurrentProject.Connection, adOpenKeyset, adLockReadOnly
    If lngCount = 1 Then DPersent = Nz(rst.Fields(0), 0): Set rst = Nothing: Exit Function

     k = p * (lngCount - 1) / 100 + 1
     If (k / Int(k)) = 0 Or (k / Int(k)) = 1 Then
      rst.AbsolutePosition = CLng(k)
      DPersent = Nz(rst.Fields(0), 0)
     Else
      part = k - Int(k)
      rst.AbsolutePosition = CLng(Int(k))
      x1 = Nz(rst.Fields(0), 0)
      rst.MoveNext
      x2 = Nz(rst.Fields(0), 0)
      DPersent = (1 - part) * x1 + part * x2
     End If

    Set rst = Nothing
Exit_dPersent:
     Exit Function

Err_dPersent:
     Select Case Err.Number
         Case Else
             MsgBox "(" & Err.Number & ") " & Err.Description & " â ïðîöåäóðå dPersent "
             Resume Exit_dPersent
     End Select
End Function