# Average over Last 90 Days - Multiple Sheets

#### KMason17

##### New Member
I have created an example version of the spreadsheet I am attempting to create.

Each months sheet looks like what I have posted below. I am looking to use one of these sheets each month. I would then like an analysis tab where I can look at;

-Overall Average of "Test Scores" - (I can and have achieved this)
-Last 90 Day Average of "Test Scores"
-Last 90 Day Average of "Test Scores" for all 4 categories separately
-Last 90 Day Average of Individual People's "Test Scores"
-Last 90 Day Average of Individual People's "Test Scores" for all 4 categories separately

I haven't been able to figure out the 90 Day average, as if I use AVERAGEIFS and 2 "Test Scores" are on the same day then it messes up the average.

Here are the sheets I am using, any help would be appreciated!

(For a bonus I am also considering an additional tab where I can pull these results up using filters and maybe VLOOKUP so that I can pull forward one persons results so that when I do 1 to 1 feedback sessions they aren't looking at other people's scores but I have no idea if I'm even being reasonable. I'm focusing on the 90 Day Average first)

Testing Sheet.xlsx
BCDE
2Under 2 Minute Test
3Test ReferenceDate of TestScore
4Person 155566601/01/20200.0%
5Person 255577701/02/202010.0%
6Person 355588801/03/202020.0%
7Person 455599901/04/202030.0%
8Person 555611001/05/202040.0%
9Person 655622101/06/202050.0%
10Person 755633201/07/202060.0%
11Person 855644301/08/202070.0%
12Person 955655401/09/202080.0%
13Person 1055666501/10/202090.0%
14Person 1155677601/11/2020100.0%
15Person 1255688701/12/202087.5%
16Person 1355699801/01/202187.5%
17Person 1455710901/02/2021100.0%
18Person 1555722001/03/2021100.0%
1961.7%
March '21
Cell Formulas
RangeFormula
E19E19=IFERROR(AVERAGE(E4:E18),"")

Testing Sheet.xlsx
BCDE
225 to 10 Minute Test
23Test ReferenceDate of TestScore
24Person 155566701/01/20200.0%
25Person 255577801/02/202010.0%
26Person 355588901/03/202020.0%
27Person 455600001/04/202030.0%
28Person 555611101/05/202040.0%
29Person 655622201/06/202050.0%
30Person 755633301/07/202060.0%
31Person 855644401/08/202070.0%
32Person 955655501/09/202080.0%
33Person 1055666601/10/202090.0%
34Person 1155677701/11/2020100.0%
35Person 1255688801/12/202087.5%
36Person 1355699901/01/202187.5%
37Person 1455711001/02/2021100.0%
38Person 1555722101/03/2021100.0%
3961.7%
March '21
Cell Formulas
RangeFormula
B24:B38B24=B4
E39E39=IFERROR(AVERAGE(E24:E38),"")
Cells with Conditional Formatting
CellConditionCell FormatStop If True
B24:B38,B44:B58,B64:B78Cell Value=0textNO

Testing Sheet.xlsx
BCDE
42Over 20 Minute Test
43Test ReferenceDate of TestScore
44Person 155566801/01/20200.0%
45Person 255577901/02/202010.0%
46Person 355589001/03/202020.0%
47Person 455600101/04/202030.0%
48Person 555611201/05/202040.0%
49Person 655622301/06/202050.0%
50Person 755633401/07/202060.0%
51Person 855644501/08/202070.0%
52Person 955655601/09/202080.0%
53Person 1055666701/10/202090.0%
54Person 1155677801/11/2020100.0%
55Person 1255688901/12/202087.5%
56Person 1355700001/01/202187.5%
57Person 1455711101/02/2021100.0%
58Person 1555722201/03/2021100.0%
5961.7%
March '21
Cell Formulas
RangeFormula
B44:B58B44=B4
E59E59=IFERROR(AVERAGE(E44:E58),"")
Cells with Conditional Formatting
CellConditionCell FormatStop If True
B24:B38,B44:B58,B64:B78Cell Value=0textNO

Testing Sheet.xlsx
BCDE
62Alternative Test
63Test ReferenceDate of TestScore
64Person 155566901/01/20200.0%
65Person 255578001/02/202010.0%
66Person 355589101/03/202020.0%
67Person 455600201/04/202030.0%
68Person 555611301/05/202040.0%
69Person 655622401/06/202050.0%
70Person 755633501/07/202060.0%
71Person 855644601/08/202070.0%
72Person 955655701/09/202080.0%
73Person 1055666801/10/202090.0%
74Person 1155677901/11/2020100.0%
75Person 1255689001/12/202087.5%
76Person 1355700101/01/202187.5%
77Person 1455711201/02/2021100.0%
78Person 1555722301/03/2021100.0%
7961.7%
March '21
Cell Formulas
RangeFormula
B64:B78B64=B4
E79E79=IFERROR(AVERAGE(E64:E78),"")
Cells with Conditional Formatting
CellConditionCell FormatStop If True
B24:B38,B44:B58,B64:B78Cell Value=0textNO

### Excel Facts

Can a formula spear through sheets?
Use =SUM(January:December!E7) to sum E7 on all of the sheets from January through December
Hi

I am giving a formula solution to calculate last 90 days average. Hopefully, you can adapt it to solve your problem.

To calculate average of last 90 calendar days, I used the following formula in E2

=AVERAGEIFS(B1:B13,A1:A13,"<="&E1,A1:A13,">="&(E1-90))

Kind regards

Saba

Thanks for that formula, I had used something similar with "<",TODAY()-90 instead of the E1 scenario you have put in.

I will try yours tomorrow and hopefully I can get it to work for multiple sheets. Does yours solve the problem I mentioned for results on the same day?

After some testing I cant get this formula working over multiple sheets. I have received a #VALUE! error.

I believe it would be something to do with pulling multiple dates from multiple areas and therefore not correctly calculating the formula.

So unfortunately I still need help with this solution

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