Reporting Period

Need help to create 12-month running total by customer_id which include the following:
1.  MonthlyTotal
2. Monthly Percentage,
3. Previous Month total,  
3.  YTD
4 . YTD Percentage


Below is an example of what I am trying to accomplish. Within the example there are customer_id , 23 and 24. Each row of data represents one month along with sales amount. The variable I would like to calculate is the "sales_amout", which is the 12 month running total within the customer_id. As you can see, the first 12 "sales_amount" is blank because there hasn't been 12 months of data yet.


this Data table for example is a short list of 12 months of data:

customer_id        Month                    Sales_Amount

23                         01JAN2013

23                         02JAN2013

23                         03JAN2012

24                         01DEC2012            10.00
                                      .
24                         02DEC2012             30.00

24                         03DEC2012             50.00    


Here is my code  and code is not working:

Data TOTAL_SALES; 
Set SALES; /** allows first. and last. processing **/
By customer_id  month prev_month; 

RETAIN total 0 monthTotal 0  month1 – month12  prevmonth_tot 0;

if sales_amount = . then delete;
/* month 1 though  month 12*/
         ARRAY sales_amount {12} $ month1-month12;
         
        IF first.sales_amount THEN do;
           do i = 1 to 12;
              sales(i)='';
            end;
        end;
        n+1;
         sales(n)=sales_amount;
        IF last.customer_id THEN do n=0; output; end;
	       

 
/*Month Total*/
month_total + sale_amount;
total + sale_amount;
total = sum(of month1 – month12);
 total + sales_amount
if FIRST.customer_id then monthTotal = 0      ; 
if LAST.customer_id then output ; 

/*Month Percentage*/
month/month
pct=sales_amount/total


/*previous month*/

Array mths {12} month1 – month12;
do i = 2 to 12;

index1 = month(date); /** extract month from date value **/
mths{index1} = mths{index1} + sales_amount;

if first.customer_id{i} then do prevmonth_tot{i} =0;
if Last.customer_id{i} then output;


/*YTD*/

Array months {12} month1 – month12;

index2 = month(date); /** extract month from date value **/
months{index} = months{index} + sales_amount;
if last.customer_id then do; /** last observation for customer **/
YTD_total = sum(of month1 – month12); /** year-to-date total **/
output; /** output one observation per customer **/
do i = 1 to 12;
months{i} = 0; /** reset to zero for next customer **/
end;
end;


/*YTD* Percentage*/
do i=12;
ytd = (i)/total

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Deleted by Netminder, no points refunded:  10/21/2013 8:40:21 PM
https://www.experts-exchange.com/R_24694.html