.. _DataQuantiles:

Data: Quantiles (Request)
==========================

**Source Key** 

  The key associated with the data set of interest. 

**Column**

  The column of interest. 

**Quantile**

  A value bounded on the interval (0,1), where X is the value below
  which X as a percentage of the data fall. For instance if the
  quantile .25 is requested, the value returned will be the value
  within the range of the column of data below which 25% of the data
  fall.

**Max Qbins** 

  The number of bins into which the column should be split before the
  quantile is calculated. As the number of bins approaches the number
  of observations the approximate solution approaches the exact
  solution. 

**Multiple Pass**
  
  Only 3 possible entries: 
  *0*: Calculate the best approximation of the requested quantile in
  one pass. 
  *1*: Return the exact result (with a maximum iteration of 16 passes)
  *2*: Return both a single pass approximation and multi-pass exact
  answer. 

**Interpolation Type**

  When the quantile falls between two in-data values, it is necessary
  to interpolate the true value of the quantile. This can be done by
  mean interpolation, or linear interpolation. 

  *2*: Mean interpolation
  *7*: Linear interpolation