The crossfilter group.reduce add and remove functions take parameters p and v. What are p and v short for in this context?
In numerous crossfilter examples, crossfilter is stored in a variable called ndx. What is ndx short for?
group.reduce follows a similar pattern to the JS built-in Array.reduce with the first argument of the callback being the previous value and the second argument being the current value.
p is the value returned by the previous invocation (or the value returned from init in first iteration) and
c is the current value for the row being operated on.