Script Explained

Script:                RTTcCoppock

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Purpose:            Edwin Coppock developed the Coppock Indicator with one sole purpose: to identify the commencement of bull markets. The indicator was devised for use on the Dow Jones Industrial Average but is suitable for use on other market indices or averages. When the indicator was published in Barron’s (1962), it was intended to generate buy signals in the S&P 500 only, and the suggested signal was an upturn in the Coppock Curve from an extreme low
Although often late, the Coppock Indicator has produced very reliable signals in the past.
A long-term price momentum indicator, it is used primarily to recognize major bottoms in the stock market. It is calculated as a 10-month weighted moving average of the sum of the 14-month rate of change and the 11-month rate of change for the index.

To save time, it is recommended to set the global chart parameters to "calculate visible points only". This means the script calculates and draws only for the days visible in the current window. (see "Parameters" below)

If you zoom out and wish to expand the plot, right-click inside the window, select the script's Properties, and click "OK". That will redraw the plot for the larger time frame.

Generally, plotted scripts work on any time scale.
However, the Coppock Indicator is commonly applied to MONTHLY charts only.

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References:        Investopedia
IncredibleCharts: Coppock Indicator
Topline Charts: Interpretation

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Parameters:       MA 1st RoC Period = period, over which one Rate of Change is calculated
2nd RoC Period = period, over which the other Rate of Change is calculated
WMA of above = period, over which the Weighted MA of their sum is calculated
Line Colour = colour of the WMA
Zero Colour = shows a flat line at 0, which is important to locate trend breaks

Global (File) Parameter Setting for Chart to draw plotted scripts faster:

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Comparison of Coppock Indicator versus the Trinity Break Indicators.

While both indicators have similar characteristics, Trinity also considers volume changes where volume records are available. Coppock ignores volume completely. When volume data are not available or unreliable, as is often the case with indices, Coppock has been used successfully to support Trinity's envelope breaks. For this purpose, a "Directional" version of this script has also been created.

Directional Coppock Indicator, highlighting likely breaks of trend.