ERSA Data in MetaStock


When ERSA finishes its calculations, the data is stored in ASCII files below your data folders.  The installation program automatically adds ERSA custom formulas and explorations to MetaStock.  You can also create your own MetaStock tools using the ERSA data. 

To plot the ERSA values in a MetaStock chart:
- Run the calculations.
- Open a MetaStock chart.
- Plot the ERSA formula in the chart.  If you don't get what you expect, see troubleshooting.

ERSA Explorations
Before running the ERSA Explorations, you must set the MetaStock Exploration options to load enough data.  Go to Tools | Explorer and click on the Options button.  In the Data Loading field, specify at least 250 periods.

ERSA Report
This exploration shows the 250-day (if that's what you calculated) ERS values for the most recent day, for 5 days ago (approximately one week), for 21 days ago (appx. one month), for 60 days ago (appx. one quarter), for 125 days ago (appx. six months), and for 250 days ago (appx. one year).  Use this report to see which stocks are gaining strength and which are losing strength.  The report can be sorted by any column simply by clicking on the column heading. 

ERSA XX-XX six month performance
Ten explorations that calculate the six month price performance of each decile of stocks.  For example, the "DeBry.com ERSA 70-79 six month performance" will tell you how stocks that had ERS values of 70-79 six months ago have performed in the ensuing six months. The following table shows the columns in the report.

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Close Performance ERS then ERS now
The latest
closing price		 The performance in
the last six months		 The external relative strength value six months ago The external relative
strength value now

To get the average return, copy the report from the Explorer, paste it into Excel, sum up the Performance column, then divide by the number of stocks, to get the average performance.

ERSA movers - 20 point gainers
Finds stocks that have gained 20 or more relative strength points (e.g., from 50 to 70 or more), in the last 21 days.

ERSA movers - 20 point losers
Finds stocks that have lost 20 or more relative strength points (e.g., from 50 to 30 or less), in the last 21 days.

Creating your own tools using ERSA data

The ERSA values can be used by any MetaStock formula tool, including the Indicator Builder, the Explorer, the System Tester, and the Expert Advisor.  To access the ERSA values, simply add the following text where you want it:  ExtFml( "ERSA.ExternalRelativeStrength")

Troubleshooting
Q.  After running ERSA, I still don't get values for some of my stocks.
A.  It's likely that your Load Periods in ERSA is greater than the number of periods available in those charts.  Reduce the number of periods to load in ERSA and re-run the calculations, and you should get data for those stocks.

Q.  The Explorer columns say "N/A"
A.  Change your Explorer options to load 250 time periods
      (press the Options button on the Explorer dialog).

 

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