This is a trading item or a component that was created using QuantShare by one of our members.
This item can be downloaded and used by QuantShare Trading Software.
Trading items are of different types. There are data downloaders, trading indicators, trading systems, watchlists, composites/indices...
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This downloader is based on the QuantShare blog post: <a href="http://www.quantshare.com/sa-435-getting-accurate-backtesting-results-survivorship-bias-free-s-p-500">Getting Accurate Backtesting Results: Survivorship bias-free S&P 500</a>
It allows you to create a survivorship bias-free database of several indices. It downloads historical composition of an ETF that tracks an index then creates a custom database by assigning the value "1" to each stock that was part of that index at a specific date.
Backtesting using a survivorship bias-free database is extremely important if you want to get simulation results that are as accurate as possible. You may also want to get historical data for delisted stocks. You can obtain a list of delisted stocks here: US delisted symbols, and download data for those stocks using: Historical Quotes for Delisted US Stocks
Here is how to create a survivorship bias-free database of S&P 500 Index:
- Download and install this item
- Open the download manager by selecting "Download -> Download Manager"
- Select it then click on "Open Selected Downloader"
- In "productID" tab, type "239726" to create the historical composition of the S&P 500 Index
- In "Dates" tab, select a start and end dates then click on "Save"
- Click on "Start downloading" to begin the downloading process
You can check the product ID for different ETFs in the ishares.com website. The product ID can be seen in the URL after you select an ETF.
After the data is downloaded, a new field whose name is "iShares Core S&P 500 ETF" is created. You can access the data using the following function:
inIndex = GetData('index', 'iShares Core S&P 500 ETF');
For more information, please click on the above blog post link.
Trading financial instruments, including foreign exchange on margin, carries a high level of risk and is not suitable for all investors. The high degree of leverage can work against you as well as for you. Before deciding to invest in financial instruments or foreign exchange you should carefully consider your investment objectives, level of experience, and risk appetite. The possibility exists that you could sustain a loss of some or all of your initial investment and therefore you should not invest money that you cannot afford to lose. You should be aware of all the risks associated with trading and seek advice from an independent financial advisor if you have any doubts.