30-day WMA for backtesting

[amnon]

hi guys, i am very new to this. can anyone tell me what i have to do if i want to backtest a very simple 30-period WMA system, where you go long if the period ends above, and short if the period ends below. thanks in advance for any help...
amnon

[ACM]

amnon
In the Back Testing folder of Formulas you should have a formula called btEMA.efs that can easily be modified to do what you want. Open it with the Editor (Tools-> EFS-> Editor...) and replace
if(study == null) study = ema(10);
with
if(study == null) study = wma(30);
Save the study with a different name so as not to overwrite the original then apply it to a chart and run the Back Tester.
If you are unfamiliar with how to write formulas for back testing and/or how to use the Strategy Analyzer you may want to review the various tutorials that are available in the EFS KnowledgeBase in the Help Guides and Tutorials folder
Alex

[amnon]

alex, thanks for your help. i have the btema.efs, but it does not have the line you say. it has these line:
var study = new MAStudy(10, 0, "Close", MAStudy.EXPONENTIAL);

function preMain() {
setPriceStudy(true);
}

function main() {
var v = study.getValue(MAStudy.MA);

if(v == null)
return;


if(close() >= v) {
if(!Strategy.isLong()) {
Strategy.doLong("Crossing Up", Strategy.CLOSE, Strategy.THISBAR);
}

} else {
if(!Strategy.isShort()) {
Strategy.doShort("Crossing Down", Strategy.CLOSE, Strategy.THISBAR);
}
}

if(Strategy.isLong()) {
setBarBgColor(Color.green);
} else if(Strategy.isShort()) {
// setBarBgColor(Color.red);
}


return v;
}

where should i make the changes?

thanks,
amnon

[ACM]

amnon
In that script replace
var study = new MAStudy(10, 0, "Close", MAStudy.EXPONENTIAL);
with
var study = new MAStudy(30, 0, "Close", MAStudy.WEIGHTED);
What version and build of eSignal are you running (see under Help-> About)?
Alex

[amnon]

7.91, i am updating it to the latest version.

[ACM]

amnon
That is what I was going to suggest next. Once you upgrade eSignal to 8.0 (build 782) you should have the most recent version of btEMA.efs which includes the line I indicated in my first reply.
Alex