Problem with FORECAST formula.

S.H.A.D.O.

S.H.A.D.O.

Well-known Member
Joined
Sep 6, 2005
Messages
1,915
Good evening,

I am having trouble with a FORECAST formula.

This formula works when the cells are hardcoded into the formula and the fotmula is copied across...
Code: 
=FORECAST($B2297,E15:E2296,$B15:$B2296)

Now I have a calculated figure which resides in cell A1 and changes when a new row of figures is added to the bottom of the data.

I want to adapt the formula so that when a new row of data is added to the bottom it takes that extra row of data into consideration for the new forecast.

Basically, I want something like this...

Code: 
=FORECAST($A1 + 1,E15:E & A1 + 14,$B15:$B & A1 + 14)

I hope this makes sense.

Thanks in advance.
 

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Assuming this array formula in A1, which yields the number of the last row with value in column B.

Code: 
[TABLE="width: 64"]
<tbody>[TR]
  [TD="width: 64"]=MAX(IF(B:B<>"",ROW(B:B)))[/TD]
[/TR]
</tbody>[/TABLE]

Try this for your forecast.

Code: 
[TABLE="width: 64"]
<tbody>[TR]
  [TD="width: 64"]=FORECAST(INDIRECT("B"&A1),OFFSET(E15,,,A1-1,1),OFFSET(B15,,,A1-1,1))[/TD]
[/TR]
</tbody>[/TABLE]
 
Upvote 0
Thanks for the reply estevaoba, it is appreciated.

Unfortunately it does not give me the correct answer.
My forecast are in cells E10:K10 (hardcoded) and your forecast are in cells E6:K6.

Excel 2007
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Forecast >

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</tbody>
Forecast​

[TABLE="width: 85%"]
<tbody>[TR]
[TD]
Worksheet Formulas[TABLE="width: 100%"]
<tbody>[TR]
[TH="width: 10"]Cell
[/TH]
[TH="align: left"]Formula
[/TH]
[/TR]
[TR]
[TH="width: 10"]A1
[/TH]
[TD="align: left"]=SUMIF($A$2:$A$3,">0")
[/TD]
[/TR]
[TR]
[TH="width: 10"]A2
[/TH]
[TD="align: left"]=COUNTIF(K15:K21,">0")
[/TD]
[/TR]
[TR]
[TH="width: 10"]A3
[/TH]
[TD="align: left"]=COUNTIF(K22:K22,">0")
[/TD]
[/TR]
[TR]
[TH="width: 10"]E6
[/TH]
[TD="align: left"]=FORECAST(INDIRECT("$B"&$A1),OFFSET(E15,,,$A1-1,1),OFFSET($B15,,,$A1-1,1))
[/TD]
[/TR]
[TR]
[TH="width: 10"]F6
[/TH]
[TD="align: left"]=FORECAST(INDIRECT("$B"&$A1),OFFSET(F15,,,$A1-1,1),OFFSET($B15,,,$A1-1,1))
[/TD]
[/TR]
[TR]
[TH="width: 10"]G6
[/TH]
[TD="align: left"]=FORECAST(INDIRECT("$B"&$A1),OFFSET(G15,,,$A1-1,1),OFFSET($B15,,,$A1-1,1))
[/TD]
[/TR]
[TR]
[TH="width: 10"]H6
[/TH]
[TD="align: left"]=FORECAST(INDIRECT("$B"&$A1),OFFSET(H15,,,$A1-1,1),OFFSET($B15,,,$A1-1,1))
[/TD]
[/TR]
[TR]
[TH="width: 10"]I6
[/TH]
[TD="align: left"]=FORECAST(INDIRECT("$B"&$A1),OFFSET(I15,,,$A1-1,1),OFFSET($B15,,,$A1-1,1))
[/TD]
[/TR]
[TR]
[TH="width: 10"]J6
[/TH]
[TD="align: left"]=FORECAST(INDIRECT("$B"&$A1),OFFSET(J15,,,$A1-1,1),OFFSET($B15,,,$A1-1,1))
[/TD]
[/TR]
[TR]
[TH="width: 10"]K6
[/TH]
[TD="align: left"]=FORECAST(INDIRECT("$B"&$A1),OFFSET(K15,,,$A1-1,1),OFFSET($B15,,,$A1-1,1))
[/TD]
[/TR]
[TR]
[TH="width: 10"]E10
[/TH]
[TD="align: left"]=FORECAST($B21,E15:E20,$B15:$B20)
[/TD]
[/TR]
[TR]
[TH="width: 10"]F10
[/TH]
[TD="align: left"]=FORECAST($B21,F15:F20,$B15:$B20)
[/TD]
[/TR]
[TR]
[TH="width: 10"]G10
[/TH]
[TD="align: left"]=FORECAST($B21,G15:G20,$B15:$B20)
[/TD]
[/TR]
[TR]
[TH="width: 10"]H10
[/TH]
[TD="align: left"]=FORECAST($B21,H15:H20,$B15:$B20)
[/TD]
[/TR]
[TR]
[TH="width: 10"]I10
[/TH]
[TD="align: left"]=FORECAST($B21,I15:I20,$B15:$B20)
[/TD]
[/TR]
[TR]
[TH="width: 10"]J10
[/TH]
[TD="align: left"]=FORECAST($B21,J15:J20,$B15:$B20)
[/TD]
[/TR]
[TR]
[TH="width: 10"]K10
[/TH]
[TD="align: left"]=FORECAST($B21,K15:K20,$B15:$B20)
[/TD]
[/TR]
[TR]
[TH="width: 10"]B16
[/TH]
[TD="align: left"]=B15+1
[/TD]
[/TR]
[TR]
[TH="width: 10"]B17
[/TH]
[TD="align: left"]=B16+1
[/TD]
[/TR]
[TR]
[TH="width: 10"]B18
[/TH]
[TD="align: left"]=B17+1
[/TD]
[/TR]
[TR]
[TH="width: 10"]B19
[/TH]
[TD="align: left"]=B18+1
[/TD]
[/TR]
[TR]
[TH="width: 10"]B20
[/TH]
[TD="align: left"]=B19+1
[/TD]
[/TR]
[TR]
[TH="width: 10"]B21
[/TH]
[TD="align: left"]=B20+1
[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[/TR]
</tbody>[/TABLE]

Thanks in advance.
 
Last edited:
Upvote 0
I don't know if this is clearer!

Excel 2007
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[TD="align: right"]26
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[TD="align: right"]17.9
[/TD]

[TD="align: center"]7
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[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=D7E4BC]#D7E4BC[/URL] "]Forecast >
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[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=D7E4BC]#D7E4BC[/URL] , align: center"]41
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[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=D7E4BC]#D7E4BC[/URL] , align: center"] 9
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[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=D7E4BC]#D7E4BC[/URL] , align: center"]19
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[TD="align: center"]12
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[TD="bgcolor: #000000, align: center"][/TD]
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[TD="bgcolor: #000000, align: center"][/TD]

[TD="align: center"]13
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[TD="align: right"][/TD]
[TD="bgcolor: #969696, align: center"][/TD]
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[TD="bgcolor: #C0C0C0, align: center"][/TD]
[TD="bgcolor: #969696, align: center"][/TD]

[TD="align: center"]14
[/TD]
[TD="align: right"][/TD]
[TD="bgcolor: #969696, align: center"][/TD]
[TD="bgcolor: #C0C0C0, align: center"][/TD]
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[TD="bgcolor: #C0C0C0, align: center"][/TD]
[TD="bgcolor: #C0C0C0, align: center"][/TD]
[TD="bgcolor: #C0C0C0, align: center"][/TD]
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[TD="bgcolor: #C0C0C0, align: center"][/TD]
[TD="bgcolor: #C0C0C0, align: center"][/TD]
[TD="bgcolor: #969696, align: center"][/TD]

[TD="align: center"]15
[/TD]
[TD="align: right"][/TD]
[TD="bgcolor: #969696, align: center"]1
[/TD]
[TD="bgcolor: #C0C0C0, align: center"][/TD]
[TD="bgcolor: #C0C0C0, align: right"][/TD]
[TD="bgcolor: #969696, align: center"]30
[/TD]
[TD="bgcolor: #969696, align: center"] 3
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[TD="bgcolor: #969696, align: center"] 5
[/TD]
[TD="bgcolor: #969696, align: center"]44
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[TD="bgcolor: #969696, align: center"]22
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[TD="bgcolor: #C0C0C0, align: center"]10
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[TD="align: center"]16
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[TD="align: right"][/TD]
[TD="bgcolor: #969696, align: center"]2
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[TD="bgcolor: #C0C0C0, align: right"][/TD]
[TD="bgcolor: #969696, align: center"]16
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[TD="bgcolor: #969696, align: center"] 6
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[TD="bgcolor: #C0C0C0, align: center"]37
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[TD="align: center"]17
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[TD="align: right"][/TD]
[TD="bgcolor: #969696, align: center"]3
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[TD="bgcolor: #C0C0C0, align: center"][/TD]
[TD="bgcolor: #C0C0C0, align: right"][/TD]
[TD="bgcolor: #969696, align: center"]21
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[TD="bgcolor: #969696, align: center"]11
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[TD="align: center"]18
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[TD="bgcolor: #C0C0C0, align: center"][/TD]
[TD="bgcolor: #C0C0C0, align: right"][/TD]
[TD="bgcolor: #969696, align: center"]26
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[/TD]

[TD="align: center"]19
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[TD="align: right"][/TD]
[TD="bgcolor: #969696, align: center"]5
[/TD]
[TD="bgcolor: #C0C0C0, align: center"][/TD]
[TD="bgcolor: #C0C0C0, align: right"][/TD]
[TD="bgcolor: #969696, align: center"]13
[/TD]
[TD="bgcolor: #969696, align: center"] 3
[/TD]
[TD="bgcolor: #969696, align: center"]38
[/TD]
[TD="bgcolor: #969696, align: center"] 5
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[/TD]
[TD="bgcolor: #969696, align: center"] 9
[/TD]
[TD="bgcolor: #C0C0C0, align: center"]30
[/TD]

[TD="align: center"]20
[/TD]
[TD="align: right"][/TD]
[TD="bgcolor: #969696, align: center"]6
[/TD]
[TD="bgcolor: #C0C0C0, align: center"][/TD]
[TD="bgcolor: #C0C0C0, align: right"][/TD]
[TD="bgcolor: #969696, align: center"]27
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[TD="bgcolor: #969696, align: center"]29
[/TD]
[TD="bgcolor: #969696, align: center"]39
[/TD]
[TD="bgcolor: #969696, align: center"] 3
[/TD]
[TD="bgcolor: #969696, align: center"]44
[/TD]
[TD="bgcolor: #969696, align: center"] 2
[/TD]
[TD="bgcolor: #C0C0C0, align: center"] 6
[/TD]

[TD="align: center"]21
[/TD]
[TD="align: right"][/TD]
[TD="bgcolor: #969696, align: center"]7
[/TD]
[TD="bgcolor: #C0C0C0, align: center"][/TD]
[TD="bgcolor: #C0C0C0, align: right"][/TD]
[TD="bgcolor: #969696, align: center"][/TD]
[TD="bgcolor: #969696, align: center"][/TD]
[TD="bgcolor: #969696, align: center"][/TD]
[TD="bgcolor: #969696, align: center"][/TD]
[TD="bgcolor: #969696, align: center"][/TD]
[TD="bgcolor: #969696, align: center"][/TD]
[TD="bgcolor: #C0C0C0, align: center"][/TD]

</tbody>
Forecast​

[TABLE="width: 85%"]
<tbody>[TR]
[TD]
Worksheet Formulas[TABLE="width: 100%"]
<tbody>[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]
[TH="width: 10"]Cell
[/TH]
[TH="align: left"]Formula
[/TH]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]A1
[/TH]
[TD="align: left"]=SUMIF($A$2:$A$3,">0")
[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]A2
[/TH]
[TD="align: left"]=COUNTIF(K15:K21,">0")
[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]A3
[/TH]
[TD="align: left"]=COUNTIF(K22:K22,">0")
[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]E6
[/TH]
[TD="align: left"]=FORECAST(INDIRECT("$B"&$A1),OFFSET(E15,,,$A1-1,1),OFFSET($B15,,,$A1-1,1))
[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]F6
[/TH]
[TD="align: left"]=FORECAST(INDIRECT("$B"&$A1),OFFSET(F15,,,$A1-1,1),OFFSET($B15,,,$A1-1,1))
[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]G6
[/TH]
[TD="align: left"]=FORECAST(INDIRECT("$B"&$A1),OFFSET(G15,,,$A1-1,1),OFFSET($B15,,,$A1-1,1))
[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]H6
[/TH]
[TD="align: left"]=FORECAST(INDIRECT("$B"&$A1),OFFSET(H15,,,$A1-1,1),OFFSET($B15,,,$A1-1,1))
[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]I6
[/TH]
[TD="align: left"]=FORECAST(INDIRECT("$B"&$A1),OFFSET(I15,,,$A1-1,1),OFFSET($B15,,,$A1-1,1))
[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]J6
[/TH]
[TD="align: left"]=FORECAST(INDIRECT("$B"&$A1),OFFSET(J15,,,$A1-1,1),OFFSET($B15,,,$A1-1,1))
[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]K6
[/TH]
[TD="align: left"]=FORECAST(INDIRECT("$B"&$A1),OFFSET(K15,,,$A1-1,1),OFFSET($B15,,,$A1-1,1))
[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]E10
[/TH]
[TD="align: left"]=FORECAST($B21,E15:E20,$B15:$B20)
[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]F10
[/TH]
[TD="align: left"]=FORECAST($B21,F15:F20,$B15:$B20)
[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]G10
[/TH]
[TD="align: left"]=FORECAST($B21,G15:G20,$B15:$B20)
[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]H10
[/TH]
[TD="align: left"]=FORECAST($B21,H15:H20,$B15:$B20)
[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]I10
[/TH]
[TD="align: left"]=FORECAST($B21,I15:I20,$B15:$B20)
[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]J10
[/TH]
[TD="align: left"]=FORECAST($B21,J15:J20,$B15:$B20)
[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]K10
[/TH]
[TD="align: left"]=FORECAST($B21,K15:K20,$B15:$B20)
[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]B16
[/TH]
[TD="align: left"]=B15+1
[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]B17
[/TH]
[TD="align: left"]=B16+1
[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]B18
[/TH]
[TD="align: left"]=B17+1
[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]B19
[/TH]
[TD="align: left"]=B18+1
[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]B20
[/TH]
[TD="align: left"]=B19+1
[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]B21
[/TH]
[TD="align: left"]=B20+1
[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[/TR]
</tbody>[/TABLE]



Thanks in advance.
 
Last edited:
Upvote 0
Good morning,

I have managed to crack it!

I needed to add 15 to the ("B"&$A1+15) because of the position of the next number to evaluate on and take out the -1 from the known_y’s and kmown_x’s.

Code: 
=FORECAST(INDIRECT("B"&$A1+15),OFFSET(E15,,,$A1,1),OFFSET($B15,,,$A1,1))

I am going to see if I can write a bit of code to do this so the new FORECAST values are entered into cells E10:K10 and M10:S10. That way I can just click a button after I have inputted new data at the bottom of the table.

Thanks in advance.
 
Upvote 0
Good afternoon,

I managed to put some code together to achieve this...

Code: 
Sub test()
    Range("E10:S10").ClearContents
    Range("E10").Resize(1, 7).Formula = _
            "=FORECAST(INDIRECT(""B"" & $A1+15),OFFSET(E15,,,$A1,1),OFFSET($B15,,,$A1,1))"
    Range("M10").Resize(1, 7).Formula = _
            "=FORECAST(INDIRECT(""B"" & $A1+15),OFFSET(M15,,,$A1,1),OFFSET($B15,,,$A1,1))"
    Range("E10:S10").Value = Range("E10:S10").Value
    Range("E10:K10,M10:S10").NumberFormat = "0"
End Sub

Thanks.
 
Upvote 0
Good!

As to your post #4 , I see that if you have A1=MAX(IF(B:B<>"",ROW(B:B)))-14, the range by formula OFFSET(B15,,,A1-1,1) would be the same as B15:B2296, as you originally were trying to get.

But, any way, I'm glad you got it figured out.

Godspeed!
 
Upvote 0
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