Category archives for Market Data

25 Years German DAX: A success story?

On July 1st, 1988 German DAX was published. It was not only an index of the German stock market: It introduced a new methodology computing a stock market index. The German DAX was the first popular index to include weights according to market capitalization and calculating returns including dividends. Now, after 25 years it is […]

Historical performance lies! Beware of survivor bias.

Often you find studies how well a specific fund or trading strategy has performed. You must be aware of the fact that basically all studies based on historical data lie – or at least do not tell the full story. There are two highly underestimated effects: Survivor bias and fat tails. Both effects make poor […]

Quandl: A Wikipedia for Numerical Data

Red quandl.com alpha logo

For data analysts like myself, one of the most useful pages on any blog resides on this website. The comprehensive list of data sites Andreas put together is indispensable because finding numerical data online, even though it is abundant, is so difficult and time consuming.

Post Crisis Financial Modelling – What changes?

I recently stumbled upon an interesting book about post-crisis interest-rate modelling. Besides future changes in the LIBOR and possible EURIBOR fixing after the manipulations of the past few years, counter-party default and collateral become important. Changes in Interest-Rate and Credit Instrument Pricing Pre-crisis, there was a risk-free rate on which the market agreed. This way, different […]

What is Historical Volatility and Why Do We Need Implied Volatilities?

Chart of VDAX and DAX volatility

Looking at financial instruments, one often finds the term implied volatility. In this post, we want to describe what it is and what you can do with it. We start refreshing the term historical volatility and then we explain the implied volatility. An example of German DAX with real data concludes this post. Historical Volatility […]

Is there an esay way to get public web data into Excel ?

There are many free data sources: In a previous post, I published a list a free market data sources. Now, I would like to point you to an interesting project: WIKIPOSIT. This project aggregates many data sources such that you can access market data and other statistics with a simple API. Or, you can export […]

The Easiest Back-Testing of Trading Strategies: MS Excel Pivot Table!

MS Excel Pivot Table in Backtesting of a Trading Strategy

Before using specialized tools for back-testing I propose that one tries the MS Excel Pivot Table first. The pivot table tool is great for inspection, filtering and analyzing large data sets. In this article, I will present how to create a simple timing-based strategy and how to compute its historical performance.

Sell in May and Go Away But Remember to Come Back in September. Really?

Sell in May and go away is an old wisdom which is interesting to analyze. And the continuation “Remember to come back in September” completes this wisdom to a real trading strategy. This strategy is quite old. Many sources say that the original saying comes from traders in the City of London and was “Sell in May […]

Comprehensive List of Free Historical Market Data Sources

Often people ask me where they can find historical data of stock prices, commodities, interest-rates, bonds, fx rates … . In previous posts, we already looked at live data feeds for Matlab, and Excel. Then, we looked at how to load historical data.  Now, we want to focus on where to get the data itself.

The Price of Gold is Constantly Rising. Or, is Money Just Losing its Value?

In the last decade, gold constantly rose in value. In this post, we will use public data to look into the value relationship of gold and money. Value of gold measured in different currencies Gold is definitely one of the oldest currencies. Until 1971, USD and gold were essentially the same using a fixed conversion rate. […]

How can I visualize my model data in an interactive webpage?

A brilliant website is the perfect example for user friendly interactive data visualization: Gapminder. This website presents statistical data about the countries of the world and how it changes in time. A user-friendly AJAX user interface allows you to get gain new insights exploring this data. They have done a great job. Google bought this […]

How do I get free real-time market Data into Excel?

This is a though one… Everybody wants real time market data – in MS Excel, in Matlab, in Java, in Theta Suite etc. But, obtaining market data is very hard and cost intensive because the stock exchanges do not want to provide real-time data for free. Ok, but what can you do about it?

How do you get free historical market data?

This is a very important and usual task. Historical data is mainly required for risk management purposes, model validation and back-testing. For these tasks software systems like Theta Suite, Matlab, Java or Excel are the main work space. We need to import the data here.