average every 6th cell in a column

[tamiluchi]

Hi. I need to get the average of every 6th cell in a column, excluding errors
--- three times.
The first average should be every 6th cell beginning with z4, the second
every 6th cell beginning with z6, and the third every 6th cell beginning with
z8.
Is there an easy way to achieve these 3 averages?

Tammie

 

[Barb Reinhardt]

Try something like this:

=AVERAGE(IF(MOD(ROW($Z$4:$Z$48),6)=4,IF(ISNUMBER($Z$4:$Z$48)<>"",$Z$4:$A$48))) for row 4

=AVERAGE(IF(MOD(ROW($Z$6:$Z$48),6)=0,IF(ISNUMBER($Z$6:$Z$48)<>"",$Z$6:$A$48))) for row 6

=AVERAGE(IF(MOD(ROW($Z$8:$Z$48),6)=2,IF(ISNUMBER($Z$8:$Z$48)<>"",$Z$8:$A$48))) for row 8

Accept each of these using CTRL SHIFT ENTER

I think that should do it.

 

[Bob Phillips]

Z4 on:
=AVERAGE(IF((MOD(ROW($Z$4:$Z$1000),6)=4)*($Z$4:$Z$1000<>""),$Z$4:$Z$1000))

Z6 on:
=AVERAGE(IF((MOD(ROW($Z$4:$Z$1000),6)=0)*($Z$4:$Z$1000<>""),$Z$4:$Z$1000))

Z8 on:
=AVERAGE(IF((MOD(ROW($Z$4:$Z$1000),6)=2)*($Z$4:$Z$1000<>""),$Z$4:$Z$1000))
--
HTH

Bob Phillips

(remove xxx from email address if mailing direct)

 

[Duke Carey]

Three array formulas, meaning enter them with Ctrl-Shift-Enter

for the first one:
=AVERAGE(IF(MOD(ROW(Z4:Z1000)-4,6)=0,Z4:Z1000))

second one
=AVERAGE(IF(MOD(ROW(Z6:Z1000)-6,6)=0,Z4:Z1000))

last one
=AVERAGE(IF(MOD(ROW(Z8:Z1000)-8,6)=0,Z4:Z1000))

 

[tamiluchi]

Using these formulas, I'm getting the div/0 error in the first 2 averages and
the third average is incorrect. (I figured it manually for a check)

 

[Ron Coderre]

Try these ARRAY FORMULAS*:

For data in Z4:Z30

Every 6th item beginning with Z4
=AVERAGE(IF(ISNUMBER($Z$4:$Z$30)*(MOD(ROW($Z$4:$Z$30)-4,6)=0),$Z$4:$Z$30))

Every 6th item beginning with Z6
=AVERAGE(IF(ISNUMBER($Z$6:$Z$30)*(MOD(ROW($Z$6:$Z$30)-6,6)=0),$Z$6:$Z$30))

Every 6th item beginning with Z8
=AVERAGE(IF(ISNUMBER($Z$8:$Z$30)*(MOD(ROW($Z$8:$Z$30)-8,6)=0),$Z$8:$Z$30))

*Note: For array formulas, hold down [Ctrl] and [Shift] when you press
[Enter], instead of just pressing [Enter]

Is that something you can work with?
Does that help?
***********
Regards,
Ron

XL2002, WinXP

 

[tamiluchi]

Thanks, but I'm still getting an error. Maybe I should clarify "ignoring
errors". The cells being averaged contain averages themselves. I'm trying to
get an overall average in 3 categories. Some of the cells have an error
because that particular employee did nothing in that particular category
during this time frame. I need the formula to ignore those cells with errors
in getting the overall average. Sorry if I wasn't clear on that.

 

[Bob Phillips]

Forgot to add that these are array formulae, should be committed with
Ctrl-Shift-Enter, not just Enter.

--
HTH

Bob Phillips

(remove xxx from email address if mailing direct)

 

[tamiluchi]

Fabulous!! That worked perfectly. Thank you so very much.
Tammie

Try these ARRAY FORMULAS*:

For data in Z4:Z30

Every 6th item beginning with Z4
=AVERAGE(IF(ISNUMBER($Z$4:$Z$30)*(MOD(ROW($Z$4:$Z$30)-4,6)=0),$Z$4:$Z$30))

Every 6th item beginning with Z6
=AVERAGE(IF(ISNUMBER($Z$6:$Z$30)*(MOD(ROW($Z$6:$Z$30)-6,6)=0),$Z$6:$Z$30))

Every 6th item beginning with Z8
=AVERAGE(IF(ISNUMBER($Z$8:$Z$30)*(MOD(ROW($Z$8:$Z$30)-8,6)=0),$Z$8:$Z$30))

*Note: For array formulas, hold down [Ctrl] and [Shift] when you press
[Enter], instead of just pressing [Enter]

Is that something you can work with?
Does that help?
***********
Regards,
Ron

XL2002, WinXP

Hi. I need to get the average of every 6th cell in a column, excluding errors
--- three times.
The first average should be every 6th cell beginning with z4, the second
every 6th cell beginning with z6, and the third every 6th cell beginning with
z8.
Is there an easy way to achieve these 3 averages?

Tammie

 

[Ron Coderre]

Thanks for the feedback, Tammie....I'm glad that worked for you.

***********
Regards,
Ron

XL2002, WinXP

Fabulous!! That worked perfectly. Thank you so very much.
Tammie

Try these ARRAY FORMULAS*:

For data in Z4:Z30

Every 6th item beginning with Z4
=AVERAGE(IF(ISNUMBER($Z$4:$Z$30)*(MOD(ROW($Z$4:$Z$30)-4,6)=0),$Z$4:$Z$30))

Every 6th item beginning with Z6
=AVERAGE(IF(ISNUMBER($Z$6:$Z$30)*(MOD(ROW($Z$6:$Z$30)-6,6)=0),$Z$6:$Z$30))

Every 6th item beginning with Z8
=AVERAGE(IF(ISNUMBER($Z$8:$Z$30)*(MOD(ROW($Z$8:$Z$30)-8,6)=0),$Z$8:$Z$30))

*Note: For array formulas, hold down [Ctrl] and [Shift] when you press
[Enter], instead of just pressing [Enter]

Is that something you can work with?
Does that help?
***********
Regards,
Ron

XL2002, WinXP

Hi. I need to get the average of every 6th cell in a column, excluding errors
--- three times.
The first average should be every 6th cell beginning with z4, the second
every 6th cell beginning with z6, and the third every 6th cell beginning with
z8.
Is there an easy way to achieve these 3 averages?

Tammie