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Category: Finance
MCarloRisk

MCarloRisk

       iOS iPhone

Stock price / probability risk analyzer app for the common man. Why rely on the tea leaves of chart reading when you can apply real statistics and historical resampled data to your analysis? While charting tools such as Bollinger bands, moving averages, and candlesticks are generated only on historical data, this app takes past data and remixes it via Monte Carlo methods to generate thousands of possible future price walks, then computes the probabilities of those price outcomes. Also works for ETFs.

Estimates future price distribution using random walk theory, where random samples are chosen from the history of the stock in question.

Background discussion: E. Fama article on early random walk studies from the 1960's:

http://www.ifa.com/Media/Images/PDF%20files/FamaRandomWalk.pdf

New Monte Carlo / dynamic Plot tab help (January 2015):

http://diffent.com/PresentationMC.pdf

New model calibration tutorial:

http://diffent.com/tuning1.pdf

Example use case & training guide for studying "AAPL to $320" can be found at:

http://diffent.com/AAPL320arialP.pdf

The app uses prior data from the stock in question for volatility estimates.

User can control how far back in time to use historical data to capture only the current "epoch" of a company or of the market as a whole if desired.
Built-in backtesting, verification, and model tuning tools.

-- Details --

This app models daily stock returns as a stable stochastic process and estimates a future price distribution by Monte Carlo re-sampling from an "empirical distribution" of a user-specified subset of prior (known) daily returns.

Be sure to press the Run Monte button on the Monte Carlo tab after changing settings or downloading a new data set. The MC is not run automatically after each change, because it can be a bit time consuming if you want the computation done for many days forward.

This app downloads historical data from Yahoo Finance as base data to resample. Prices are converted to daily returns [P(t)/P(t-1)] before resampling. The user can choose how far back to resample. By estimating a probability distribution of future prices at the user-specified investment horizon in this manner, we can give risk-of-loss estimates in thumb-rule fashion, to a first approximation.

Reports out estimated price and %loss estimates at the commonly used levels of 1st percentile and 5th percentile (1% and 5% risk). Also reports out median (50th percentile) price estimates at the given number of days forward. Calculations may be performed on Yahoo daily Closing or Adjusted daily Closing price data. An artificial shock filter is provided, which can be used to reject the resampling of prior returns that are artificially large (due to splits or other artificial re-valuations that do not affect the underlying value of the asset). Theory of operation is described in detail under the Theory tab.

The stochastic model may be tuned or calibrated only by adjusting the maximum number of days backwards to sample. One may want to tune the model differently for a different number of days forward estimate.

Stochastic Model Validation (backtest) features:

On the Monte Carlo tab, you can withhold any number of recent days from the model and then plot the results of the stochastic risk forecast as lower-bound envelopes at 1% and %5 and all other estimated probability (risk) levels dynamically after the model run is completed.

Validate tab:

This allows you to perform an exhaustive validation on your model by withholding several points, computing the model, comparing the forward prediction of the model versus the actual reserved data, and repeating this in increasing time sequence for all withheld points.

The app provider makes no claims as to the suitability of this app for any purpose whatsoever, and the user should consult an investment advisor before making investment decisions.

What's new

Minor graphic updates, make better use of larger format screens on iP5/6/6+. New Monte Carlo tab tutorial: http://diffent.com/PresentationMC.pdf


Screenshots

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Last changed:
Jan 23, 2015
Category:
Finance
Developer:
differential enterprises
Version:
4.9
Size:
0.3 MB

Current Version Average Rating:
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All Versions Average Rating:
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