I ran a 3-year back test on my strategy on WLP 6 64bit version. The test was on 15 min bars. And around 2?23/10 or so ( you can't get the exact date on the equity curve chart in WLP by pointing at the location) the blue line which is the Buy and Hold line goes straight up in a vertical line from about $43,000 or so to over $300,000. My strategy equity curve ( the green) seems more normal.

I sent a screen shot to an experienced programmer friend of mine, and he said it looked like there was a bug in the software. It might be a good idea to look into this matter. Thanks.

Joanna

This is probably not a bug.. it's much more likely a problem with your data.

QUOTE:
( you can't get the exact date on the equity curve chart in WLP by pointing at the location)

You might be able to if you zoomed the graph. Drag an imaginary square from top left to lower right around the point you're interested in. To unzoom drag from lower right to upper left.

Since your strategy apparently doesn't create a trade on the symbol for that day, you'll have to be inventive on finding the bad symbol. If you were to post a picture of what you're looking at, we might be able to suggest something. Maybe your experienced programmer friend can suggest something.

I use Fidelity data. So what should I do about the data problem?

How do I post a picture of the chart? I have a Screen shot software, but I did not think that I could sent it to you as an email attachment or can I?

Joanna

Data from any provider can have spikes in it.

As for the image, you need to upload it to a image host (google "image hosting"), click the IMG tag above this text box, and paste the link to your image between the tags.

So if there is a problem with Fidelity data, aren't you going to report that problem, and try to fix it? Thanks.

Joanna

You may use the Portfolio Inspector visualizer (MS123 Visualizers library) to click on the affected date and determine what was going on.

QUOTE:
So if there is a problem with Fidelity data, aren't you going to report that problem, and try to fix it?

Even if I knew where the problem was in your local data, no. You can correct your own local data using the Bar Data Editor (see User Guide).

Fidelity have a lot of data consumers, and WLP's data comes from the same place as everyone else's. "Prints" that create spikes in our data histories are terrible for us, but apparently are something someone else wants to see. Frankly, there's no good way to suggest fixes for Fidelity's price and volume data, but I urge you to call Fidelity support and ask them what can be done when you find something you want fixed.

On the other hand, if there's a problem with Wealth-Lab's download process or otherwise getting data, then we're sure to investigate it.