Public Function DPersent(strNameFields As String, strNameTBL As String, Optional strFilter As String = "", Optional p As Integer) As Variant
'àâòîð: altu 28.11.2006 ã.
'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
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 dMedian "
Resume Exit_dPersent
End Select
End Function
