1) Determine how many nesting levels of group variables you want to have, and make a sample 
  worksheet with appropriate number of columns. 
2) Run the descriptive statistics of columns with the group variables setting the 
  recalculation mode to "Auto".
3) Save the workbook as an analysis template, say with name "myGroupStatsBook.ogw". 
  ("File> Save Workbook as Analysis Template" menu)
4) From your script, open the analysis template by:
    doc -o "C:\mydata\myGroupStatsBook.ogw";
  If desired you can put the names of group variables into their column's long names.
5) Copy the data into the opened workbook, and you get the aggregated statistics automatically.

//define a range to store the results
range nn=[Book1]1!3;
for(ii=1; ii<=4; ii++)  
{
//define the sum variable
double aa;
//calculate the end and start of each bin
double bb=(ii-1)*5; 
//calculate the sum value of each bin
aa=sumif(col(B),"col(A) > bb && col(A) <= (bb+5)"); 
nn[ii]=aa;
}