These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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The method of approximation inside a group. When for example 30 days are grouped into one month, this determines what value should represent the group. Possible values are "average", "averages", "open", "high", "low", "close" and "sum". For OHLC and candlestick series the approximation is "ohlc" by default, which finds the open, high, low and close values within all the grouped data. For ranges, the approximation is "range", which finds the low and high values. For multi-dimensional data, like ranges and OHLC, "averages" will compute the average for each dimension.
Custom aggregate methods can be added by assigning a callback function
as the approximation. This function takes a numeric array as the
argument and should return a single numeric value or null. Note
that the numeric array will never contain null values, only true
numbers. Instead, if null values are present in the raw data, the
numeric array will have an .hasNulls property set to true. For
single-value data sets the data is available in the first argument
of the callback function. For OHLC data sets, all the open values
are in the first argument, all high values in the second etc.
Since v4.2.7, grouping meta data is available in the approximation
callback from this.dataGroupInfo. It can be used to extract information
from the raw data.
Defaults to average for line-type series, sum for columns, range
for range series, hlc for HLC, and ohlc for OHLC and candlestick.