topic Re: Count Distinct If in QlikView

Count Distinct If

Thu, 03 Jul 2014 09:02:38 GMT

Hi all,

I'm struggling with an expression from yesterday about count distinct. I'm quite sure there is a simple solution for my problem, but I'm not able to find it.

I've these data:

ID	Sub_ID	value	target
74		55,0000	50
77		86,0000	90
79	0	94,0000	95
79	1	91,0000	95
79	2	97,0000	95
105	6	11,4422	35
105	9	36,0000	35
105	2	123,0644	35

and I need to find the number of distinct ID for which the avg(value)>avg(target) - in this example the number is 2, because for ID 74 e 105 avg(value)>avg(target).

I tried with this expression:

Count(DISTINCT

IF( avg(valore)>avg([target]),

ID))

but it doesn't work because of avg function.

If I remove the avg function, using the following expression:

Count(DISTINCT

IF( (valore)>([target]),

ID))

I get a wrong result, in fact for example ID=79 is considered because there is at least one line where value is greater than target, even if avg(value) (94) is less than avg(target) (95) and it should not be considered.

Please, let me know if you have any suggestion.

Thanks in advance and best regards.

Re: Count Distinct If

Gysbert_Wassenaar — Thu, 03 Jul 2014 09:14:34 GMT

When you nest aggregation functions you need to use the aggr function:

=Count(DISTINCT

IF( aggr( avg(value),ID) >aggr(avg([target]),ID),

ID))

Re: Count Distinct If

Thu, 03 Jul 2014 09:35:28 GMT

Thanks a lot! It's perfect!

Re: Re: Count Distinct If

Fri, 04 Jul 2014 14:57:53 GMT

Hi Gysbert,

I've another doubt related to this topic and I try to expose it using an example.

I've this simple script:

Catalog:

LOAD * INLINE [

ID, Target

1,10

2,5

3,100

4,8

5,20

];

Values:

LOAD * INLINE [

ID,subID,DATE, Value

1, 1, 01/01/2014, 11

2, 1, 01/01/2014, 6

3, 1, 01/01/2014, 90

3, 2, 01/01/2014, 93

4, 1, 01/01/2014, 30

5, 1, 01/01/2014, 11

5, 2, 01/01/2014, 8

2, 1, 01/02/2014, 8

2, 2, 01/02/2014, 7

5, 1, 01/02/2014, 118

5, 2, 01/02/2014, 115

];

My goal is to find how many IDs have average values greater than target, for the selected month and the previous month.

Basically, with this sample data I've this situation:

		01/01/2014		01/02/2014
ID	Target	=avg(Value)	On Target	=avg(Value)	On Target
1	10	11	Y	-	-
2	5	6	Y	7,5	Y
3	100	91,5	N	-	-
4	8	30	Y	-	-
5	20	9,5	N	116,5	Y

Therefore I've 3 IDs On Target in January and 2 IDs On Target in February.

To calculate ID on target in selected month and in previous month I use this two expressions:

Current Month:

=Count(DISTINCT

IF( aggr(avg(Value),ID)>Target,

ID)

)

Previous Month:

=Count( DISTINCT

IF( aggr(avg({$<[DATE] = {"$(=(AddMonths(Date([DATE]),-1)))"}>} Value),ID)>Target,

ID)

)

The problem is that when I select February, I got a wrong result for IDs on Target in previous month. With this expression I got only 1 IDs for January but the correct result is 3.

I guess that the problem is because when I select february only ID 2 and 5 are considered, and therefore in January only one of this two is on target.

Do you have any suggestion on how can I consider all IDs with the previous expression?

Re: Re: Count Distinct If

Gysbert_Wassenaar — Fri, 04 Jul 2014 15:01:56 GMT

Try adding the set modifier to the outer COUNT aggregation function too.

Re: Re: Count Distinct If

Fri, 04 Jul 2014 15:52:15 GMT

It works! Thanks again! You're a great EXPERT!

Re: Count Distinct If

Tue, 08 Jul 2014 10:11:44 GMT

Hi Gysbert,

I was reading your post Calculating rolling n-period totals, averages or other aggregations but I'm not able to use it on my example.

Basically I want to display this measure:

=Count(DISTINCT

IF( aggr(avg(Value),ID)>Target,

ID)

)

in a bar chart with last six motnhs in X axis (without considering the selected month). Here below an example usign previous sample data (with further data for additional months).

I've tryed with this expression:

=Count( {$<[DATE] = {">$(=(AddMonths(Date(Max([DATE])),-6)))"}>} DISTINCT

IF( aggr(avg({$<[DATE] = {">$(=(AddMonths(Date(Max([DATE])),-6)))"}>}Value),ID)>Target,

ID)

)

but it doesn't work.

I hope you can help me once again to find the correct solution.

Thanks in advance!

Re: Re: Count Distinct If

Tue, 08 Jul 2014 13:22:53 GMT

I was missing [DATE] parameter for the aggr() function.

The correct expression is as follow:

=Count( {$<[DATE] = {">$(=(AddMonths(Date(Max([DATE])),-6)))"}>} DISTINCT

IF( aggr(avg({$<[DATE] = {">$(=(AddMonths(Date(Max([DATE])),-6)))"}>}Value),[DATE],ID)>Target,

ID)

)