## Getting the average amount of transaction for specifics event

Solved
Occasional Contributor
Posts: 13

# Getting the average amount of transaction for specifics event

Hi guys,

I got a table with a lot of events.

table sample would look like

ItemID Event ID

ABC 100

ABC 200

ABC 200

ABC 300

CBA 100

CBA 200

CBA 300

For the same Item i can have a lot of  different events associated, for one item i can have multiple time the same events.

What i would like to achieve is to get the average count of event in the whole population of items.

e.g a table that would look like

Event ID AverageAmountofTx

100     1

200    1.5

300    1

What would be the most efficient way to carry out that testing? Is there a direct way to do this using proc means?

Probably an easy way to do that but it's friday ,-) My table is huge so i would like to avoid creating an intermediary table with:

ItemIT EVENT ID Count

ABC 100 1

ABC 200 2

ABC 300 1

etc

Accepted Solutions
Solution
‎03-30-2012 11:42 PM
Super User
Posts: 10,770

## Re: Getting the average amount of transaction for specifics event

```data have;
input Item_ID \$ Event_ID;
datalines;
ABC 100
ABC 200
ABC 200
ABC 300
CBA 100
CBA 200
CBA 300
;
run;
proc sql ;
create table want as
select event_id,count(event_id)/count(distinct item_id) as avg
from have
group by event_id;
quit;

```

Ksharp

All Replies
Contributor
Posts: 37

## Re: Getting the average amount of transaction for specifics event

PROC SUMMARY DATA = HAVE NWAY MISSING;

CLASS EVENTID ITEMID;

OUTPUT OUT = HAVE1;

RUN;

_FREQ_ WILL BE YOUR COUNT AND YOU SHOULD ALSO HAVE OTHER STATISTICS DISPLAYED

Regular Contributor
Posts: 233

## Getting the average amount of transaction for specifics event

data have;
input Item_ID \$ Event_ID;
datalines;
ABC 100
ABC 200
ABC 200
ABC 300
CBA 100
CBA 200
CBA 300
;
run;

proc sort data = have;
by Item_ID;
run;

proc freq data = have;
tables Item_ID*Event_ID / list missing norow nocol nocum nopercent;
run;

Output:

Item_ID    Event_ID    Frequency
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ABC             100           1
ABC             200           2
ABC             300           1
CBA             100           1
CBA             200           1
CBA             300           1

Occasional Contributor
Posts: 13

## Getting the average amount of transaction for specifics event

Thanks guys for the quick answers,  my question was more to know if you can avoid creating that table:

Item_ID    Event_ID    Frequency

ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒ

ABC             100           1

ABC             200           2

ABC             300           1

CBA             100           1

CBA             200           1

CBA             300           1

I would like to create the following table directly without using an intermediary table (my source table is huge)

Event_ID AverageCount

100                1

200              1.5

300                1

Contributor
Posts: 37

## Getting the average amount of transaction for specifics event

didnt you get those required statiistics using my code for Proc summary??

Regular Contributor
Posts: 233

## Re: Getting the average amount of transaction for specifics event

data have;

input Item_ID \$ Event_ID;

datalines;

ABC 100

ABC 200

ABC 200

ABC 300

CBA 100

CBA 200

CBA 300

;

run;

proc sql;

select Event_id,avg(cnt) as aver from

(select count(item_id) as cnt, event_id,item_id from have group by event_id, Item_id)

group by event_id;

quit;

Tested n working.

Solution
‎03-30-2012 11:42 PM
Super User
Posts: 10,770

## Re: Getting the average amount of transaction for specifics event

```data have;
input Item_ID \$ Event_ID;
datalines;
ABC 100
ABC 200
ABC 200
ABC 300
CBA 100
CBA 200
CBA 300
;
run;
proc sql ;
create table want as
select event_id,count(event_id)/count(distinct item_id) as avg
from have
group by event_id;
quit;

```

Ksharp

Occasional Contributor
Posts: 13

## Re: Getting the average amount of transaction for specifics event

Thanks guys, will give it a try on Monday, the table will have over 1 billion records pretty soon, so will see how each query perform.

I was also thinking maybe i should just do the average on a given period of time and annualize it so that creating an intermediary table would be ok...

Will still give a try to all queries above will keep you guys updated.

Posts: 5,526

## Re: Getting the average amount of transaction for specifics event

It depends if you want the average number of each event type in items in which they appear (which Ksharps' query above will calculate) or the average over all items. Compare :

data have;

input Item_ID \$ Event_ID;

datalines;

ABC 100

ABC 200

ABC 200

ABC 300

CBA 100

CBA 200

;

proc sql ;

create table want1 as

select event_id,count(event_id)/count(distinct item_id) as avg

from have

group by event_id;

create table want2 as

select event_id,count(event_id)/(select count(distinct item_id) from have) as avg

from have

group by event_id;

select want1.*, want2.avg as avg2

from want1, want2 where want1.event_ID=want2.event_ID;

quit;

PG

PG
Occasional Contributor
Posts: 13

## Re: Getting the average amount of transaction for specifics event

Awesome guys, great to have so many different answers!

Thanks for the additional information PG,  i am using Ksharp query but yours just gave me more depth for my analysis

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