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The ratio adjusted index is used to retain historical trigger levels like
"more than x level means yyy" type of thing. Twenty years ago or so there
were ~1500 mostly common stocks traded on the NYSE. Today we have ~3500
issues traded there with a large number of issues other than US common
stocks. You can use a ratio of the present # of issues divided by some
historical # of issues like 1500 to adjust the advancing and declining
numbers used to calculate the MCO and MCS. This keeps the interpretation
of numeric levels more or less consistent with past research.
As I mentioned some people also adjust for those non common stocks as well
as ratio adjustments.
Sid
At 10:24 PM 9/26/2003 -0400, you wrote:
Sid/anyone: what is the "Ratio adjusted" summation index and how does
its calculation differ from the Index that is not ratio adjusted??
I came upon an interesting indicator (actually a pair of indicators),
and I am trying to get them programmed into AB in order to do some
backtesting. You have to go to stockcharts.com to see it...
<http://stockcharts.com/def/servlet/SC.web?c=$NASI,uu[l,a]daclynay[dd][ph>http://stockcharts.com/def/servlet/SC.web?c=$NASI,uu[l,a]daclynay[dd][ph
.02,.20][iLah12,26,9]&pref=G
Cut and paste into your address window if the email line gets word
wrapped.
This URL to stockcharts will show the $NASI and SAR of the $NASI. That
in itself looks promising but the chart also shows the 12,26,9 MACD.
Based on the way stockcharts works, this MACD is of the $NASI.
I have an AFL for the Summation index, and I applied the SAR to it...so
far so good. But when I plot a 12/26/9 MACD of my version of the
Summation index, it does not match the MACD on the stockcharts
chart--not by a mile.
So, hence my question about "ratio adjusted". Also, the y axis values
on my chart are not anywhere near those on the SCharts chart (having no
doubt to do with the constant that starts the series), but the SHAPE
seems very close if not identical. So a related question is: will the
MACD function produce the correct looking histogram if the EMAs which go
into its calculation are off of a similarly shaped chart, but one with
different y axis values?
That sounds confusing even as I write it, but perhaps you will
understand what I mean.
Any comments?
Ken
-----Original Message-----
From: Sidney Kaiser [mailto:s9kaiser@xxxxxxxxxxx]
Sent: Friday, September 26, 2003 8:04 PM
To: amibroker@xxxxxxxxxxxxxxx
Subject: Re: [amibroker] Re: McClellan Summation
Most people just add a "fudge factor" to the summation value until it
matches the vendor they use for some specific date...like today. It
should
continue to match in the future if you use the same advance decline
values
that the vendor uses. Many vendors try to compensate for preferred
stocks,
ADRs, bond type closed end funds, foreign issues etc so there are many
values of the summation index floating around out there.
HTH
Sid
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