In technical analysis charting, support and resistance levels
are two important parameters to determine entry and exit points, coupled with
volume information. This method however, requires some users’ discretion
to “draw” the lines on the chart. This
could lead to ambiguity. One method to overcome this uncertainty is by using
histogram.
Histogram may help the user determine the high frequency of
common price points, without relying on a “eye-balling” technique to draw the
line. Furthermore, it has an advantage over the line drawing technique,
which is the ability to tell the strength of the support or resistance levels.
The other flexibility of histogram is that it can use any
parameter of the end-of-day (EOD) data to construct the chart. One may use either daily high or low point,
or even both points to build the histogram as long as the information is
available.
Technical charts, either candlesticks or bar chart, generally
are time based. The histogram is a
frequency-based chart, a straight forward tool to identify high occurrence
activities. It can be used for other
purposes as well such as daily price range target determination, and technical
indicators accuracy evaluation.
Chart 1 below shows the volume weighted histogram of weekly
closing price of KLCI from June 2009 till August 2018. Clearly from the
chart, 1630 is a strong support line. In fact, the post GE14 political uncertainty
that caused KLCI to plunge 12% from mid-May to end-of June, found strong
support at these regions and subsequently reversed the downtrend. At the time this article was written, KLCI
was trading at 1820, the immediate support based on the histogram is 1810. The next resistance line for KLCI is at 1865.
Chart
1: Volume Weighted KLCI Weekly Closing Price Histogram