Calculate Averages by sample number

[Anonymous]

Hello, 

I have a dataset where i would like to caclualte the average per sample number. 

Below is how the data is displayed in the report

Chemical,   sample number, Value 

A,               11111,                     5

B,               11111,                     6 

C,               11111,                     4

A,               11112,                     8 

B,               11112,                     9 

C,               11112,                     10

I would like this to become 

Chemical,    sample number,  Value,        Average 

A,               11111,                         5,                   15

B,               11111,                         6,                   15

C,               11111,                         4,                   15

A,               11112,                         9,                   27

B,               11112,                         8,                   27

C,               11112,                        10,                  27

Please note: I would like the average to be displayed at each row in my report. I have used averagex function and it works when my table is only displaying a unique list of sample numbers but as soon as i introduce the chemical parameter, the sample numbers are no longer aggrigated and the average function retunrns the value itself as average. 

Any help would be appreciated. 

Thank you!

[Geradav · Accepted solution]

Hi @Anonymous 

Here is the DAX statement you can use

AvgSampleNumber =
CALCULATE (
    AVERAGE ( DataSetTabl[Value] ),
    ALLEXCEPT ( DataSetTabl, DataSetTabl[Sample number] )
)

Does that work for you?

[Anonymous]

Thank you all for your replies. 

This did do the trick for me @Geradav 

AvgSampleNumber =
CALCULATE (
    AVERAGE ( DataSetTabl[Value] ),
    ALLEXCEPT ( DataSetTabl, DataSetTabl[Sample number] )
)

I have another issue now where i would like to calculate the average between two dates e.g. 

Currently its calculating the average over all sample numbers while ignoring the sample date. 

I would like to calculate and display the average between

2016-17

2017-18

2018-19

If sample number date is 01/05/18, i would like the average column to display the average by calculating over all samples from 2018 only. 

Any help would be appreciated!

[Geradav]

Maybe you'll need to open a separate post for that.

And providing some sample data might help too

[Anonymous]

That worked!!  Thank you for your help. 

I have another issue now. Sometimes the Value can be blank and if so, the formula ignores that e.g.

1010101,  13

1010101,

1010101, 85 

1010101,

1010101, 31 

The formula is returning 43 but i would like it to return 25.8

[Geradav]

@Anonymous 

In Power Query use the Replace Value function

[xuexi1890]

Hi,

i think you either edit your database in the query when blank=0, then the averagex() should work.

OR

you can count of sample number to avoid the values being blank.

[xuexi1890]

Hi,

i don't think you are presenting average, but a subtotal by sample number, below DAX might work for you.

Grand Total = CALCULATE(sum(Table1[Value]),all(Table1[Chemical]))

[Anonymous]

Hi,

Thank you for your reply. You're right! I forgot to divide the numbers. Below is the edited post. Thanks

Before 

Chemical,   sample number, Value 

A,               11111,                     5

B,               11111,                     6 

C,               11111,                     4

A,               11112,                     8 

B,               11112,                     9 

C,               11112,                     10

I would like this to become 

Chemical,    sample number,  Value,        Average 

A,               11111,                         5,                   5

B,               11111,                         6,                   5

C,               11111,                         4,                   5

A,               11112,                         9,                   9

B,               11112,                         8,                   9

C,               11112,                        10,                  9