[RESOLVED] Calculate mean with missing values

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[RESOLVED] Calculate mean with missing values

Hello,

I was wondering if there was any way to calculate a mean on several columns despite missing values ?
I attached a small simple example file.
In fact, when I add a computed variable and enter the mean formula, the mean is calculated only when all the columns have a value. When there is one missing value in a column, the mean is not calculated. When there is a missing value, I would like to calculate the mean on the others values, "ignoring" the missing one. Is it possible ?
Thanks for the help !
Attachments
Classeur2.omv
Naïde

Posts: 4
Joined: Thu Oct 04, 2018 2:37 pm

Re: Calculate mean with missing values

ni naide,

no, sorry, this isn't possible at this time. we're just looking at the best way to provide it now.

we'll hopefully be able to come back to you soon.

with thanks

jonathon

jonathon

Posts: 1270
Joined: Fri Jan 27, 2017 10:04 am

Re: Calculate mean with missing values

Hi Jonathon,

Thanks for your quick answer. I am looking forward to test this improvement !
Best,
Naïde

Posts: 4
Joined: Thu Oct 04, 2018 2:37 pm

Re: Calculate mean with missing values

hi naide,

we've added an ignore_missing argument to the MEAN and the SUM now.

you can go: MEAN(A, B, C, D, ignore_missing=1)

you'll need the 0.9.5.2 or newer

jonathon

jonathon

Posts: 1270
Joined: Fri Jan 27, 2017 10:04 am

Re: Calculate mean with missing values

Hi Jonathon,

I've just tried the ignore_missing argument and it works perfectly, thanks a lot !!!!!
And thanks for the amazing work you're doing on this software !

Best,
Naïde

Posts: 4
Joined: Thu Oct 04, 2018 2:37 pm

Re: [RESOLVED] Calculate mean with missing values

I'm testing out the ignore_missing=1 functionality, and it seems that it works to average two vectors' values (ignoring missing) for missing values on the second vector, but not first. For example (where . indicates a missing value),
X Y MEAN(X,Y,missing=1)
2 . .
3 5 4
. 3 3

Possibly I'm missing a command in the function. Assist, please and thanks?
WorkScientist

Posts: 1
Joined: Wed Jan 09, 2019 11:59 pm

Re: [RESOLVED] Calculate mean with missing values

hmm, seems to work here. could you double-check? this is what i get:

Screen Shot 2019-02-22 at 12.35.37.png (450.99 KiB) Viewed 2850 times

cheers

jonathon

jonathon

Posts: 1270
Joined: Fri Jan 27, 2017 10:04 am

Re: [RESOLVED] Calculate mean with missing values

"ignore_missing" comes really handy, thanks!

I was wondering if there is any way to calculate a mean on several columns when missing values don't exceed a certain number? For example, when taking the mean of 10 columns, I'd like to calculate the mean when there are missing values in only 2 or fewer of the columns.
gulgunaydin

Posts: 1
Joined: Fri Jun 28, 2019 10:32 am

Re: [RESOLVED] Calculate mean with missing values

hey,

there's not an easy way to do it, but you can do it with the IF and IFMISS functions. for example if you have the columns A, B, C, D you could create a computed column called `N Missing` with the formula:

IFMISS(A, 1, 0) + IFMISS(B, 1, 0) + IFMISS(C, 1, 0) + IFMISS(D, 1, 0)

and then a mean computed column with the formula:

IF(`N Missing` <= 2, MEAN(A, B, C, D, ignore_missing=1))

(or you could combine these two formulas into one, but it becomes harder to read).

Screen Shot 2019-07-01 at 13.30.06.png (118.22 KiB) Viewed 2241 times

cheers

jonathon

Posts: 1270
Joined: Fri Jan 27, 2017 10:04 am