"Exploring unique identifiers with dc.js - a comprehensive guide to grouping data by

Utilizing dc.js and crossfilter, I am creating 3 rowcharts from a csv file. The first two rowcharts are simple to set up, but the third one requires a dimension that spans multiple columns in my input csv. To achieve this, I have restructured the data so that for each column needed for that row, a new duplicate row is created with that column's value placed under a new column. See the example below;

Original structure:
ID --- rowchart1 --- rowchart2 ---- rowchart3 ----- rowchart3 ----- rowchart3 -----
1
2
3

New structure:
ID --- rowchart1 --- rowchart2 ---- newRowchart3
1
2
2
2
3
3

Although I have successfully set up the rowchart with the new constructed column, I am facing issues with displaying the original counts in the other two rowcharts. Currently, there are duplicate counts in those rowcharts.
Is there a method to group by a unique ID so that it only counts unique IDs instead of counting every single row?
Thank you.

javascriptd3.jsdc.jscrossfilter

Answer №1

If you're looking for a way to handle elements of an array as separate records in crossfilter, take a look at this discussion: Is there a way to tell crossfilter to treat elements of array as separate records instead of treating whole array as single key?

In a similar scenario where "rowchart3" values are not stored in an array, a solution can still be applied with adjustments.

The provided answer contains a jsfiddle demonstration on managing the categories manually in the chart. The function reduceAdd would need to be modified as follows:

function reduceAdd(p, v) {
   if(v.rowhart3a != "")
      p[v.rowchart3a] = (p[v.rowchart3a] || 0) + 1; //increment counts

   if(v.rowhart3b != "")
      p[v.rowchart3b] = (p[v.rowchart3b] || 0) + 1; //increment counts

   if(v.rowhart3c != "")
      p[v.rowchart3c] = (p[v.rowchart3c] || 0) + 1; //increment counts

   return p;
}

This adjustment should assist in adapting the logic to your specific case. - DJ

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