Add @RISK to Any Application!
Get great @RISK results in any application with the @RISK Developer's Kit! Click to view larger graphic. 
The @RISK Developer’s Kit (RDK) is Palisade’s widelyused risk analysis programming toolkit. The RDK allows you to build Monte Carlo simulation models using Windows and .NET programming languages, such as C, C#, C++, Visual Basic, or Visual Basic .NET. Examples of programmes written in Windows and .NET programming languages are provided.
The RDK offers access to the risk analysis and distribution fitting technology available in the world’s most widelyused risk analysis tool  @RISK for Excel. It can be used to easily create custom applications that include Monte Carlo simulation, such as financial modelling tools, corporate financial systems, and industryspecific programmes.
Unlike the Excel version of @RISK, the RDK does not require a spreadsheet to run simulations. This means user models can be larger and execute faster. All simulation results can be accessed programmatically, directly in the developer’s application. Two powerful charting engines – that of @RISK and Microsoft Excel with its extensive customisation capabilities – can be used to generate graphs of simulation results.
RDK applications can be run in a desktop, network server, or web environment. (Click
here for examples.) The RDK fully supports multithreading to allow the development
of scalable web applications. Models built using the RDK can run simulations and
generate results entirely in the user’s programme or the @RISK Interface can
be used to display reports and graphs on simulation results.
Why Use the RDK?
For many users the spreadsheet is the preferred risk modelling environment. However,
many times an application written in a standard programming language needs Monte
Carlo simulation or distribution fitting capabilities. The application will have
its own user interface, variables and model calculations. In addition, a developer
may want to allow users to access the application over a corporate network or over
the Internet.
The RDK allows custom applications such as these to run simulations and generate result
graphs and statistics. Applications written with the RDK will often run faster and
can contain larger numbers of distributions and outputs when compared with models written
in spreadsheet versions of @RISK. This is because RDK applications are compiled and
do not contain additional routines executed during spreadsheet recalculation.
Distribute Custom Solutions Over the Web
The RDK allows you to streamline the distribution of your risk analysis solutions through
enterprisewide web deployment. Serverbased risk analysis models – such as
corporate financial models, engineering applications, and financial planning tools – can
be accessed over the Internet from any browser, allowing users to enter model parameters
and inputs, run simulations, and view results and graphs. Model structure, logic,
and RDK simulation libraries are stored on the server, ensuring consistency for all
endusers and removing local installation and support issues.
ActiveX Interface Makes Integrating Risk Analysis Easy
The RDK and included BestFit Developer's Kit (BDK) now ship with two programming interfaces:
the new ActiveX interface and the standard .DLL interface.
ActiveX Interface
The new ActiveX/COM Interface makes development of custom risk analysis solutions easy.
An intuitive set of methods and properties allow the developer to quickly set up
a simulation model in a custom application – defining input probability distributions,
simulation settings, and model logic. (See a list of methods
and properties, by object, here.) The RDK also makes it easy to handle events
during a simulation run and process and display results. This interface can be used
in any ActiveXaware programming environment such as Visual Basic or C++. Example
programmes are included.
.NET AND ACTIVEX
Because the .NET environment offers the COM Interoperability feature, .NET programmers
can also take advantage of the easytouse ActiveX/COM interface. Examples in two
.NET programming languages – C# and Visual Basic .NET – are included.
DLL Interface
The RDK DLL Interface includes a library of functions that allows you to build Monte
Carlo simulation models using C, Visual Basic or other programming languages. Use
of the RDK function library requires an installed programming language and knowledge
of programming techniques. You are not, however, restricted to using these languages
for developing your simulations. Any Windowsbased language which can call .DLL functions
can be used for developing RDK applications using the RDK DLL Interface. Example
programmes in C++ and Visual Basic are included.
Monte Carlo Simulation and the RDK
Monte Carlo simulation is a quantitative risk analysis technique. Uncertain inputs
in a Monte Carlo model are represented by probability distributions of possible values.
The results you are interested in are distributions of possible outcomes; that is,
the range of possible outcomes that could occur and the likelihood of any outcome occurring.
These results are generated by letting your computer recalculate your model over and
over again, each time using different randomly selected sets of values from the probability
distributions. In effect, the computer is trying all valid combinations of inputs to
simulate all possible outcomes. This is like running hundreds or thousands of “Whatif” analyses
on your model, all at one sitting. The results are distributions of possible outcomes
that you can use to determine the probabilities of certain results occurring.
Executing a Monte Carlo simulation using the RDK is done by repeatedly executing the
portion of your programme that calculates your model. Each time the model is executed
(an iteration), different values are sampled from the distribution functions used in
your model. These sampled values are used in calculating a new set of model results.
The RDK automatically stores the results from each iteration. A simulation will execute
the number of iterations you select. A run in the RDK executes the number of simulations
you specify, with each simulation calculating the desired number of iterations.
BestFit Developer's Kit Included for Distribution Fitting
The RDK includes the BestFit Developer’s Kit (BDK) which allows you to fit probability
distribution functions to data in programmes written in C, C#, Visual Basic, or other
Windows or .NET programming languages. The BDK can be used to select probability distributions
to be used in an RDK model based on historical or sampled data. Fitting distributions
to data sets focuses a model and helps to accurately define the uncertain factors,
thereby saving time and avoiding costly errors. All of the fitting methods, distribution
functions, and many graphs in BestFit (which is integrated with @RISK Professional
and Industrial editions) are included with the BDK. Using the BDK, you can develop
your own custom applications that use the same sophisticated fitting techniques.
Apply BestFit's sophisticated distribution fitting technology to your own application with the BestFit Developer's Kit! Click to view larger graphic. 
BestFit traditionally is used for fitting distributions to data in Windows. Typically, BestFit is used in conjunction with @RISK for fitting distributions to data in spreadsheet risk analysis models. However, as with the RDK, some users have applications written in a standard programming language that they wish to add distribution fitting capabilities to. The BDK allows a custom application to fit distributions to data and generate statistics on fit results.
Fitting done in applications written with the BDK will often run faster than fitting
done in BestFit or in spreadsheet versions of @RISK. Like the RDK, this is because
BDK applications are compiled and do not contain the additional processing that occurs
when the BestFit or @RISK Interface is used.
Typical Applications that Can Incorporate the RDK
Capital
Budgeting Chemical Process Engineering Corporate Planning Cost Analysis Engineering Reliability Environmental Impacts & Policy Foreign Exchange Modeling Health Risk Assessment 
Insurance Mergers & Acquisitions Mortgage Pricing Operation Research Analysis Petroleum and Mining Resource Evaluations R&D Assessment Toxicological Analysis And More! 
@RISK Developer's Kit Features
MODEL DEFINITION
 Uncertain model inputs can be defined using any of 37 probability distribution types. Distributions can be assigned to inputs prior to simulation or sampled directly in code during a run.
 Distributions can be optionally truncated, shifted, locked to a specific value during a simulation or "stressed" to restrict sampling to a userdefined range.
 Distributions found by fitting probability distributions to data sets can be directly assigned to an input object in an RDK simulation model.
 Any number of matrices can be defined to correlate uncertain inputs.
 Graphs of theoretical probability distributions can be made using the RDK's Microsoft Excelbased charting engine.
 Any number of simulation outputs can be defined, either as single variables or grouped together as an output range.
 Model inputs and outputs are stored in standard collection object for convenient manipulation and enumeration.
DISTRIBUTION FITTING
 Historical data sets can be fit to any of 28 probability distributions.
 Sample, density or cumulative data can be fit and data can be filtered prior to fitting.
 Fit results are ranked according any of three goodnessoffit tests  ChiSquare, AndersonDarling or KolmogorovSmirnov.
 Extensive statistics on fit results are generated including mean, standard deviation and other standard statistics, along with critical values and pvalues.
 Custom chisquare binning is allowed.
 Graphs of fit results which overlay input data with fitted probability distributions are available using the RDK's Microsoft Excelbased charting engine.
 Input data sets and fit results have built in properties and methods that allow access to all fitting options and fit results directly in code. (See a list of methods and properties, by object, here.)
SIMULATION
 Available simulation settings include unlimited iterations and simulations, Monte Carlo or Latin Hypercube sampling, random number generator seeding, convergence monitoring, and autostop on convergence.
 Convergence data available directly in code during a run.
 Events notify the RDK application at the start of each simulation and iteration.
RESULTS
 Extensive statistics on model outputs and sampled inputs are generated including mean, standard deviation and other standard statistics, along with percentiles and probabilities for any userdefined values.
 Sensitivities of model output values to uncertain inputs are available through multivariate stepwise regression or correlation analysis.
 Scenario analysis is available, which determines which groups of uncertain inputs are instrumental in reaching userdefined goals.
 All results can be filtered using two different filter types.
 Raw sets of output or sampled input data can be returned directly to the RDK application.
 Model results for outputs and sampled inputs are stored in standard collection objects for convenient manipulation and enumeration in the RDK application.
 Graphs of simulation results including histograms, cumulative curves, tornado graphs
of sensitivities and summary graphs of output ranges are available using either a
Microsoft Excelbased charting engine or the standard @RISK graphing engine.
Sensitivity analysis and @RISK's powerful charting engine are among the many features of RDK . Click to view larger graphic. 
CHARTING
 RDK graphs may be generated using the Microsoft Excel charting engine, allowing extensive graph customisation using Excel's builtin properties and methods (Microsoft Excel needs to be installed on the server for network or web RDK applications).
 All results graphs and distribution function charts available in @RISK for Excel may also be generated by an RDK application in bitmap, metafile, or .JPG formats. These graphs may be used in a custom interface and be deployed over network or web servers without having Excel or @RISK installed.
 Graph type, scaling, titles and overlays can be set programmatically from the RDK application.
 Generated graphs can be easily inserted in a web page for display to end users
or returned directly to the RDK application for display in its own interface.
@RISK RESULTS INTERFACE
 Results from all RDK simulations can be viewed using the @RISK Results Interface  a prebuilt user interface that can be employed by any RDK application for displaying simulation results, including reports and graphs.
 Endusers can use the standard @RISK dialogs for defining simulation settings and monitoring simulation convergence.
 The @RISK Results Interface will be familiar to users of an RDK application that have used @RISK for Microsoft Excel.
 The @RISK Results Interface can be used when simulation libraries are installed
locally on a desktop PC or when the RDK application is run off of a network server.
RDK Distribution Functions
The RDK allows you to replace uncertain values in your simulation model with any of
37 @RISK probability distribution functions which represent a range of possible values.
Available distribution types include:
Beta Beta General BetaSubjective Binomial ChiSquare Cumulative Discrete Discrete Uniform Error Function Erlang Exponential ExtremeValue/Gumbel Gamma 
General Geometric Histogram Hypergeometric Integer Uniform Inverse Gaussian/Wald Logistic LogLogistic Lognormal Lognormal2 Negative Binomial Normal Pareto 
Pareto 2 Pearson V Pearson VI PERT Poisson Rayleigh Student's t Triangular Triangular General Uniform Weibull 
Development and Deployment of RDK Applications
The RDK Developer Edition gives you everything you need to get up and running with
your own risk analysis application. Affordable and flexible, it is ideal for developing
and testing custom risk solutions. Multiple Developer Kits can be purchased to run
applications in small workgroups. The Developer Edition includes:
DLL and ActiveX functions to perform all @RISK for Excel and BestFit features as described above
Examples in Windows and .NET programming languages
Installer for deployment of an unlimited number of 30day demo licenses of any application developed using the RDK
The Developer Edition is designed for software development and testing. To run applications in a production setting, Palisade offers customized deployment licenses. We can work with you to develop a tailored RDK licensing solution to meet your organisation’s needs. Call our Technical Sales department at 1800432RISK or email us at sales@palisade.com.au to discuss your licensing needs.
View
example models using RDK.
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