I'm trying to average only the numbers that fall within the standard
deviation. Say you have 10 numbers listed and only 7 fall in the range
of the standard deviation of the list. I need the average of only
those number that fit. I've tried several different ways but nothing
is working. Any help would be greatly appreciated!!

Thanks...mitch

lawdoggy;526336 Wrote:
I'm trying to average only the numbers that fall within the standard
deviation. Say you have 10 numbers listed and only 7 fall in the range
of the standard deviation of the list. I need the average of only
those number that fit. I've tried several different ways but nothing
is working. Any help would be greatly appreciated!!

Thanks...mitch

This is for 1 SD either side of the mean, where K7 contained the mean,
K8 the SD, and the sample data was in range F8:F31 :

Code:
--------------------
=(SUM(--(IF(F8:F31(K7-K8),1,0)*IF(F8:F31<(K7+K8),1,0)*F8:F31)))/(COUNTIF(F8:F31,"=" & K7-K8)-COUNTIF(F8:F31,"" & K7+K8))
--------------------

alternatively, this can all be put in one cell:

Code:
--------------------
=(SUM(--(IF(F8:F31(AVERAGE(F8:F31)-STDEV(F8:F31)),1,0)*IF(F8:F31<(AVERAGE(F8:F31)+STD EV(F8:F31)),1,0)*F8:F31)))/(COUNTIF(F8:F31,"=" & AVERAGE(F8:F31)-STDEV(F8:F31))-COUNTIF(F8:F31,"" & AVERAGE(F8:F31)+STDEV(F8:F31)))
--------------------
for the same sample range.


--
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On Oct 15, 2:31*pm, p45cal wrote:
lawdoggy;526336 Wrote:

I'm trying to average only the numbers that fall within the standard
deviation. Say you have 10 numbers listed and only 7 fall in the range
of the standard deviation of the list. I need the average of only
those number that fit. I've tried several different ways but nothing
is working. Any help would be greatly appreciated!!

Thanks...mitch

This is for 1 SD either side of the mean, where K7 contained the mean,
K8 the SD, and the sample data was in range F8:F31 :

Code:
--------------------
* * =(SUM(--(IF(F8:F31(K7-K8),1,0)*IF(F8:F31<(K7+K8),1,0)*F8:F31)))/(COUNTIF(F*8:F31,"=" & K7-K8)-COUNTIF(F8:F31,"" & K7+K8))
--------------------

alternatively, this can all be put in one cell:

Code:
--------------------
* * =(SUM(--(IF(F8:F31(AVERAGE(F8:F31)-STDEV(F8:F31)),1,0)*IF(F8:F31<(AVERAGE(*F8:F31)+ST DEV(F8:F31)),1,0)*F8:F31)))/(COUNTIF(F8:F31,"=" & AVERAGE(F8:F31)-STDEV(F8:F31))-COUNTIF(F8:F31,"" & AVERAGE(F8:F31)+STDEV(F8:F31)))
--------------------
*for the same sample range.

--
p45cal

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Wow!! no wonder i never figured it out. Thank you. I will mess with it
and see if I can get it to work. Thank you!

mitch

lawdoggy;526880 Wrote:
On Oct 15, 2:31*pm, p45cal wrote:
lawdoggy;526336 Wrote:

I'm trying to average only the numbers that fall within the
standard
deviation. Say you have 10 numbers listed and only 7 fall in the
range
of the standard deviation of the list. I need the average of only
those number that fit. I've tried several different ways but
nothing
is working. Any help would be greatly appreciated!!

Thanks...mitch

This is for 1 SD either side of the mean, where K7 contained the
mean,
K8 the SD, and the sample data was in range F8:F31 :

Code:
--------------------
* *
=(SUM(--(IF(F8:F31(K7-K8),1,0)*IF(F8:F31<(K7+K8),1,0)*F8:F31)))/(COUNTIF(F*8:F31,"="
& K7-K8)-COUNTIF(F8:F31,"" & K7+K8))
--------------------

alternatively, this can all be put in one cell:

Code:
--------------------
* *
=(SUM(--(IF(F8:F31(AVERAGE(F8:F31)-STDEV(F8:F31)),1,0)*IF(F8:F31<(AVERAGE(*F8:F31)+ST DEV(F8:F31)),1,0)*F8:F31)))/(COUNTIF(F8:F31,"="&
AVERAGE(F8:F31)-STDEV(F8:F31))-COUNTIF(F8:F31,"" &
AVERAGE(F8:F31)+STDEV(F8:F31)))
--------------------
*for the same sample range.

--
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Wow!! no wonder i never figured it out. Thank you. I will mess with it
and see if I can get it to work. Thank you!

mitch

I notice there's no user defined function in the original message above
which I added to the post later. Go to thecodecage.com thread to see it
- hang on a mo, Ill paste here too:
--- Automerged consecutive post before response ---
or a user defined function which you can use in vba or call from the
worksheet thus:
=SDAverage(F8:F31,1)
where the second parameter is the number of standard deviations either
side of the mean to include in the calculation. Happily, it gives the
same result as the maga-formula given earlier:

Function SDAverage(TheRange, NoOfSDs)
TheMean = Application.Average(TheRange.Value)
SD = Application.WorksheetFunction.StDev(TheRange.Value )
For Each cll In TheRange
If cll.Value TheMean - (SD * NoOfSDs) And cll.Value < TheMean + (SD
* NoOfSDs) Then
mySum = mySum + cll.Value
divisor = divisor + 1
End If
Next cll
If divisor 0 Then SDAverage = mySum / divisor Else SDAverage =
"Divide by 0"
End Function


--
p45cal

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Hi Mitch,

Another option -

=(SUM(--(IF(H2:H11=(AVERAGE(H2:H11)-STDEV(H2:H11)),1,0)*IF(H2:H11<=(AVERAGE(H2:H11)+ST DEV(H2:H11)),1,0)*H2:H11)))/(COUNTIF(H2:H11,"="&AVERAGE(H2:H11)-STDEV(H2:H11))-COUNTIF(H2:H11,"="&AVERAGE(H2:H11)+STDEV(H2:H11)) )

data is in H2:H11

enter the formula as an array formula - CTRL+SHIFT+ENTER

Peggy

"lawdoggy" wrote in message
...
On Oct 15, 2:31 pm, p45cal wrote:
lawdoggy;526336 Wrote:

I'm trying to average only the numbers that fall within the standard
deviation. Say you have 10 numbers listed and only 7 fall in the range
of the standard deviation of the list. I need the average of only
those number that fit. I've tried several different ways but nothing
is working. Any help would be greatly appreciated!!

Thanks...mitch

This is for 1 SD either side of the mean, where K7 contained the mean,
K8 the SD, and the sample data was in range F8:F31 :

Code:
--------------------
=(SUM(--(IF(F8:F31(K7-K8),1,0)*IF(F8:F31<(K7+K8),1,0)*F8:F31)))/(COUNTIF(F*8:F31,"="
& K7-K8)-COUNTIF(F8:F31,"" & K7+K8))
--------------------

alternatively, this can all be put in one cell:

Code:
--------------------
=(SUM(--(IF(F8:F31(AVERAGE(F8:F31)-STDEV(F8:F31)),1,0)*IF(F8:F31<(AVERAGE(*F8:F31)+ST DEV(F8:F31)),1,0)*F8:F31)))/(COUNTIF(F8:F31,"="
& AVERAGE(F8:F31)-STDEV(F8:F31))-COUNTIF(F8:F31,"" &
AVERAGE(F8:F31)+STDEV(F8:F31)))
--------------------
for the same sample range.

--
p45cal

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Wow!! no wonder i never figured it out. Thank you. I will mess with it
and see if I can get it to work. Thank you!

mitch

On Oct 15, 6:50*pm, "Peggy Shepard" wrote:
Hi Mitch,

Another option -

=(SUM(--(IF(H2:H11=(AVERAGE(H2:H11)-STDEV(H2:H11)),1,0)*IF(H2:H11<=(AVERAG*E(H2:H11)+S TDEV(H2:H11)),1,0)*H2:H11)))/(COUNTIF(H2:H11,"="&AVERAGE(H2:H11*)-STDEV(H2:H11))-COUNTIF(H2:H11,"="&AVERAGE(H2:H11)+STDEV(H2:H11)) )

data is in H2:H11

enter the formula as an array formula - CTRL+SHIFT+ENTER

Peggy

"lawdoggy" wrote in message

...
On Oct 15, 2:31 pm, p45cal wrote:





lawdoggy;526336 Wrote:

I'm trying to average only the numbers that fall within the standard
deviation. Say you have 10 numbers listed and only 7 fall in the range
of the standard deviation of the list. I need the average of only
those number that fit. I've tried several different ways but nothing
is working. Any help would be greatly appreciated!!

Thanks...mitch

This is for 1 SD either side of the mean, where K7 contained the mean,
K8 the SD, and the sample data was in range F8:F31 :

Code:
--------------------
=(SUM(--(IF(F8:F31(K7-K8),1,0)*IF(F8:F31<(K7+K8),1,0)*F8:F31)))/(COUNTIF(F**8:F31,"="
& K7-K8)-COUNTIF(F8:F31,"" & K7+K8))
--------------------

alternatively, this can all be put in one cell:

Code:
--------------------
=(SUM(--(IF(F8:F31(AVERAGE(F8:F31)-STDEV(F8:F31)),1,0)*IF(F8:F31<(AVERAGE(**F8:F31)+S TDEV(F8:F31)),1,0)*F8:F31)))/(COUNTIF(F8:F31,"="
& AVERAGE(F8:F31)-STDEV(F8:F31))-COUNTIF(F8:F31,"" &
AVERAGE(F8:F31)+STDEV(F8:F31)))
--------------------
for the same sample range.

--
p45cal

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Wow!! no wonder i never figured it out. Thank you. I will mess with it
and see if I can get it to work. Thank you!

mitch- Hide quoted text -

- Show quoted text -

The code works great Thank you!!! You guys rock!

mitch

Hello,

Array-enter:
=AVERAGE(IF(ABS(AVERAGE(A1:A10)-A1:A10)<=ABS(ABS(AVERAGE(A1:A10))-STDEV
(A1:A10)),A1:A10))

Regards,
Bernd

Wouldn't this be sufficient?

=AVERAGE(IF(ABS(A1:A10-AVERAGE(A1:A10))<=STDEV(A1:A10),A1:A10))

confirmed with CTRL+SHIFT+ENTER


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Sure.

Regards,
Bernd

You can do this w/o VBA and with a (relatively) simpler formula.

Suppose your data are in A1:A13, the average is in D1 and the std.
dev. in E1. Then, use the array formula
=AVERAGE(IF(ABS(A1:A13-$D$1)<=$E$1,A1:A13))

To enter an array formula complete data entry not with the combination
of SHIFT+CTRL+ENTER keys and not just the ENTER or TAB key. If done
correctly, *Excel* will show the formula enclosed in curly brackets {
and }

On Thu, 15 Oct 2009 10:09:08 -0700 (PDT), lawdoggy
wrote:

I'm trying to average only the numbers that fall within the standard
deviation. Say you have 10 numbers listed and only 7 fall in the range
of the standard deviation of the list. I need the average of only
those number that fit. I've tried several different ways but nothing
is working. Any help would be greatly appreciated!!

Thanks...mitch
Regards,

Tushar Mehta
Microsoft MVP Excel 2000-present
www.tushar-mehta.com
Excel and PowerPoint tutorials and add-ins