# Back of the Envelope

Observations on the Theory and Empirics of Mathematical Finance

## [WP] Shiny for Finance

For those familiar with R, Shiny offers a great alternative to spreadsheets. Targeted at instructors, we have a new paper introducing Shiny for finance applications in the classroom. Here is a longish abstract:

Despite the popularity of open-source languages like R and Python in modern empirical research and the data-science industry, spreadsheet programs like Microsoft Excel remain the data analysis software of choice in much of the business-school curriculum, including at IIMA. Even if instructors are comfortable with modern programming languages, they have to pitch their courses at the level of computer literacy prevalent among students. Excel then appears to be a natural choice given its popularity, but this choice constrains the depth of analysis that is possible and requires a certain amount of dumbing-down of the subject by the instructor. Recent software advances however make the ubiquitous web browser a worthy challenger to the spreadsheet. This article introduces one such browser-based tool called Shiny for bringing finance applications to the classroom and smart phones. Fueled by the availability of high-quality R packages in finance and statistics, Shiny brings together the power of HTML with the R programming language. It naturally creates an environment for the instructor to focus on the role of parameters and assumptions in analysis without the clutter of data, and allows the instructor to go beyond the toy problems that are necessitated by the nature of spreadsheets. The learning curve is short for an interested instructor with even a rudimentary exposure to programming in any language. The article ends with the discussion of a fully-worked out example of Shiny for teaching the mean variance efficient frontier in a basic investments course.

The working paper is here. It needs a bit of fine tuning yet, but comments welcome.

Written by Vineet

April 4, 2017 at 12:30 pm

## [WP] Open access temptations

Information science isn’t exactly my area of research, but it has been fun exploring the shady side of open access. Here is the abstract:

Backlash against “megapublishers” which began in mathematics a decade ago has led to an exponential growth in open access journals. Their increasing numbers and popularity notwithstanding, there is evidence that not all open access journals are legitimate. The nature of the “gold open access” business model and increasing prevalence of “publish or perish” culture in academia has given rise to a dark under-belly in the world of scientific publishing which feeds off academics’ professional needs. Many such “predatory” publishers and journals not only seem to originate out of India but also seem to have been patronized by academics in the country. This article is a cautionary note to early-career academics and administrators in India to be wary of this “wild west” of the internet and exercise due discretion when considering/evaluating open-access journals for scholarly contributions.

The working paper is here.

Written by Vineet

April 7, 2016 at 3:14 pm

Posted in Research

Tagged with , ,

## [CompFin] Installing QuantLib and QuantLib-Python in Windows

In our recent paper introducing QuantLib, we had an appendix which described how to set both QuantLib and QuantLib-Python up for use in Ubuntu and Windows. Since I rarely use Windows these days, for instructions for Windows we mostly relied on what was available on the QuantLib website and answers to relevant questions on stackoverflow.

When I got my hands on a Windows laptop recently, to my embarrassment I realized I could not use those instructions to get QuantLib and QuantLib-Python working on a Windows 7 machine. Needless to say this needed sorting out, and now it has been.

I’ll have the paper updated on our website shortly, but in the mean time here are the instructions for installing QuantLib and QuantLib-Python in Windows. These have been tested on three different Windows machines, so we are reasonably sure they work. However, if something doesn’t work for you, do drop in a comment.

Step-by-step by instructions for installing QuantLib and QuantLib-Python in Windows

1. QuantLib requires a working C++ Environment, and for the purposes of instructions here (meant for a novice), it is recommended that the user install the free Microsoft Visual Express Desktop 2013 edition which comes with Visual C++ 12 (MSVC12).
2. QuantLib-Python requires a working Python environment, and we recommend working with the Anaconda meta-package. Instructions are available from the Anaconda install page. For our purpose here, Windows users should work with the 32-bit version of Anaconda. It is recommended to install Anaconda with all the default settings, and update it by running $\texttt{conda update conda}$ and $\texttt{conda update anaconda}$. Again, it does not matter if one installs Anaconda-2.x (with Python 2.7) or Anaconda-3.x (with Python 3), but it is recommended that the user install the Python 3 version, as that’s where the Python language seems to be headed.
3. Compiling QuantLib requires Boost C++ libraries installed. And this is where the utility of working with MSVC becomes most apparent. Pre-packaged binaries for Boost are available for specific versions of MSVC (in our case MSVC12) from its sourceforge page, and installing Boost on MSVC is no more difficult than installing any other software in Windows. (Users should download the executable for the 32-bit architecture, as the free version of MSVC does not seem to contain the necessary utilities for compiling in 64-bit. There is no such problem if you have access to a professional edition of MSVC though.)
4. After installing Boost, we need to install SWIG. Pre-packaged binaries for SWIG for Windows are available from its source page (latest version 3.0.5), and it is enough to extract the SWIG zip file in a convenient folder.
6. Launch the Visual Studio command prompt: All the commands below assume that we are working in Visual Studio command prompt (or if not, all the relevant Visual Studio related environment variables have been set). It can be launched from the Start menu (in Windows 7) or from Apps (in Windows 8). If you can’t find it, see here.
• NB: Though we haven’t encountered any issue when using MSVC12, as pointed out by Andres in comments, when working with VS 2015, it might be safest to work with x64 Native Tools Command Prompt.
7. After the above steps, installing QuantLib in Windows simply requires the following steps (mind the gaps):
 cd \path\to\QuantLib-1.6
set myboost=\path\to\boost\boost_1_58_0
msbuild /p:AdditionalLibPaths=&amp;quot;%myboost\lib32-msvc-12.0&amp;quot; /p:Configuration=Release /p:Platform=Win32 QuantLib_vc12.sln 

The last step above may take a while (on an Intel i5, Windows 7 machine with 4 GB RAM it took almost 45 minutes).

Note that throughout in this post $\texttt{\textbackslash path\textbackslash to\textbackslash someplace}$ represents the directory of $\texttt{someplace}$. For example, if $\texttt{boost\_1\_58\_0}$ is installed in $\texttt{C:\textbackslash boost}$$\texttt{\textbackslash path\textbackslash to\textbackslash boost\_1\_58\_0}$ should be taken to mean $\texttt{C:\textbackslash boost\textbackslash boost\_1\_58\_0}$.

8. One should ensure that QuantLib is correctly installed in the previous step, as what follows assume a working QuantLib. If it is correctly installed, you should see something like the following message at some stage before the installation completes:
 Tests completed in 16m 50s
Test suite &amp;quot;Master Test Suite&amp;quot; passed with:
1002021 assertions out of 1002021 assertions passed
609 test cases out of 609 passed 

And at the very end:

 Build succeeded.
0 Warning(s)
0 Error(s)
Time Elapsed 00:44:20.07
9. Although not absolutely necessary, to ensure that all is well, it is recommended to also build QuantLib in Debug mode (replace ‘Release’ by ‘Debug’ in the $\texttt{msbuild}$ command in step 7 above; and will take roughly half the time it took to build the Release version), and test the code in the QuantLib Usage section on the QuantLib install page for Windows.
10. Installing QuantLib-Python requires a few extra settings. At the Visual Studio command prompt, set the following (again, mind the gaps):
 cd \path\to\QuantLib-SWIG-1.6\Python
set PATH=\path\to\Anaconda3;\path\to\Anaconda3\scripts;\path\to\swigwin-3.0.5;\path\to\QuantLib-1.6\lib;%PATH%
set QL_DIR=\path\to\QuantLib-1.6
set VS100COMNTOOLS=%VS120COMNTOOLS%
set INCLUDE=\path\to\boost_1_58_0;%INCLUDE%
set LIB=\path\to\boost\lib32-msvc-12.0;%LIB%
echo [build] &amp;gt; setup.cfg &amp;amp;&amp;amp; echo compiler=msvc &amp;gt;&amp;gt; setup.cfg 
11. Once the environment variables have been set in step 10 above, all we need is to run the following steps:
 cd \path\to\QuantLib-SWIG-1.6\Python
python setup.py wrap
python setup.py build
python setup.py test
python setup.py install 

If you are wondering how would you know that QuantLib-Python has been installed correctly, after the $\texttt{python setup.py test}$ step, you should see a message something like this:

---------------------------------------
Ran 36 tests in 1.253s
Ok
12. To be doubly sure, you should now go to Luigi Ballabio’s QuantLib page and run the examples there.

My co-author has a more detailed post on his blog discussing this, and in addition to providing motivation for some of our choices, he also describes how to install QuantLib and QuantLib-Python using only open-source tools (for “free as in free speech”) and without using Visual Studio. Highly recommended.

Update (8th July): Paper updated with these instructions.

Written by Vineet

July 7, 2015 at 2:16 am

Posted in Computing, Research

## [OS] Lubuntu: A minimalist operating system for open-source applications

with one comment

Both Windows and Ubuntu today come bundled with many applications which are of no use to most users. Separating wheat from the chaff, however, is not all that easy, or extremely tedious.

Fortunately, for those of us in research/academia who do not rely on proprietary software, and use their computers mainly for reading (using a pdf-reader), internet (using Chrome/Firefox), writing (using LaTeX, and sometimes needing basic word-processing and spreadsheet-ing), programming (using Python/R), and rely on open-source applications for these, there are two wonderful alternatives out there: Lubuntu and Xubuntu.

Both are extremely lightweight and easily customizable. You may choose either of them, and basic instructions for installing these are available on their homepages. (If you are a novice and in doubt, download the the LTS version 14.04).

FWIW, below I provide instructions for a very basic set-up of Lubuntu (because that’s what I use) for a user who mainly uses Emacs, LaTeX, Python, R and Chrome.

Before you go ahead and start following these, let me get the usual disclaimer out of the way. While the instructions below have worked for me and I happily continue to use Lubuntu, please use them at your own risk. The standard no-warranty disclaimer as in GNU GPL v3 applies.

1. Disk-partitioning scheme: While installing, Lubuntu gives user the choice to either install everything in a single partition, or ‘do something else’ and custom-partition the disk. For those who don’t understand what this means, ignore this step and move to step 2 below. Else, read on.

There are many resources out there describing optimal disk-partitioning schemes depending on the size of the hard-disk/RAM and whether or not you have a dual-boot system, but in my experience, for both standalone and dual-boot installations, the following works quite fine (but again, if you have more than 1 TB machine, you should be more liberal with /opt, /usr, /usr/local and /var):

• /boot = RAM
• /root = 4 x RAM
• /swap = 4 x RAM
• /tmp = min(4 x RAM, 16GB)
• /opt = min(4 x RAM, 16 GB)
• /usr = max(8 x RAM, 96GB)
• /usr/local = max(4 x RAM, 64GB)
• /var = max(2 x RAM, 24GB)
• /home = remaining

The alternative, of course, is to simply ignore partitioning and install everything using the default option provided by Lubuntu installer.

2. Setting up Network: If you are working on a wired PC, you need to ask your network administrator for the following: Address (IP), Network, Gateway and DNS. If you are working on a laptop, you need the WIFI SSID, security-type and possibly user login and password.

If you are behind a proxy, you need to additionally tell that to Lubuntu. To do this, follow step 1 (“Set up the proxy/proxies for most programs”) and step 3 (“Finally, set up the proxies for apt-get and Update Manager”) of instructions from the accepted answer at askubuntu here.

3. First update after install:

• sudo apt-get update && sudo apt-get upgrade
• sudo apt-get install lubuntu-restricted extras
• sudo apt-get install synaptic
• Run Update manager from Applications

4. After first update and synaptic installation: Launch synaptic and select and install the following

• emacs (metapackage), texlive-full, auctex, ess, pdftk, pdfchain, vlc, gimp, 7zip, ibritish, djview4, gnome-search-tool, python-gpgme, curl, libcurl4-openssl-dev, libreoffice

5. Other third-party software:

• Download Chrome, R and Dropbox from their homepage and follow the instructions there. For Dropbox, make sure that for the first time all files are already copied to your desired Dropbox location, else it may take eternity to sync if your connection is slow.

6. Resolving the sound-card issue (in case you can’t hear audio in your machine):

• Open the following file as super-user:
• Add the following: options snd-hda-intel index=1

7. Setting start-up applications in Lubuntu:

• Menu (Alt-F1) -> Preferences -> Default applications for LXsession -> Autostart

8. Keyboard shortcuts: For those who shy-away from using mouse and prefer keyboard to navigate, the following link lists all the available shortcuts:  https://help.ubuntu.com/community/Lubuntu/Keyboard. If you’d like to create custom keystrokes for things you use often, look here for an example (a life-saver for me really): http://askubuntu.com/questions/80145/how-can-i-lock-screen-on-lxde

9. Anaconda for Python: For installing Anaconda for Python, I quote from our recent working paper:

Although Python is available as a standalone library from the official project page, we recommend working with meta-packages like Anaconda (made available for free by the Continuum Analytics company as on date) or Canopy (made available for free by Enthought Inc. as on date). The advantage is that it is easier to install support packages and update the Python library from within these meta-packages. We have worked (and continue to work) with the Anaconda meta-package, and found it extremely convenient to work with. Instruction for installing Anaconda are available from the Anaconda install page, and we have encountered no problem in installing it in Windows or Ubuntu.In Ubuntu, if there are going to be multiple users accessing the same machine, it is advisable to install Anaconda in “\opt\” directory rather than in “\home\user\” (default) directory. Again, it does not matter if one installs Anaconda-2.x or Anaconda-3.x, but it is recommended that the user install the python3 version, as that’s where the Python language seems to be headed.

That should be enough. If something doesn’t work for you or if you have any comments, please drop a line.

Written by Vineet

April 3, 2015 at 10:00 pm

## [WP] Are investors ethics agnostic?

My colleague, an FPM and I have a new paper looking at whether stock investors care about ethical behavior on part of top management. We use the 2013 IPL match-fixing scandal surrounding Chennai Super Kings (owned by India Cements Limited) to study this issue. Here is the abstract:

In this paper we ask if the perception investors have regarding ethical nature of the management per se influences their action. In order to check for rent seeking behaviour that could arise when there is negative perception regarding ethics, we look a single company‟s management whose actions – though not related to the performance of the company – have led to doubts regarding its ethical nature. Using event study mechanism, we find that when the action leads to a positive outcome for the company, the investors’ reaction is statistically insignificant. However, when another action did not lead to any potential positive outcome, the abnormal returns associated with the company’s stock are negative and significant. Therefore, it is possible that unethical practices, even if unrelated to company’s performance, lead to lesser trust regarding the company, thereby reducing the stock prices, which suggests rent seeking behaviour.

Update: Some press coverage here.

Written by Vineet

April 3, 2015 at 7:29 pm

Posted in Research

Tagged with , , ,

## [WP] Derivatives pricing using QuantLib

My colleague and I have a new paper introducing QuantLib for pricing derivatives in practice. Here is the abstract:

Given the complexity of over-the-counter derivatives and structured products, almost all of derivatives pricing today is based on numerical methods. While large financial institutions typically have their own team of developers who maintain state-of-the-art financial libraries, till a few years ago none of that sophistication was available for use in teaching and research. For the last decade, there is now a reliable C++ open-source library available called QuantLib. This note introduces QuantLib for pricing derivatives and documents our experience using QuantLib in our course on Computational Finance at the Indian Institute of Management Ahmedabad. The fact that it is also available (and extendable) in Python has allowed us to harness the power of C++ with the ease of iPython notebooks in the classroom as well as for student’s projects.

Written by Vineet

April 3, 2015 at 7:18 pm