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PRA: Project Risk Analysis in R

Key features:

  • The Second Moment Method
  • Monte Carlo Simulation
  • Contingency Analysis
  • Sensitivity Analysis
  • Earned Value Management
  • Learning Curves
  • Design Structure Matrices
  • And more!

Installation

To install the release verion of PRA, use:

install_packages('PRA')

You can install the development version of PRA like so:

devtools::install_github('paulgovan/PRA')

Usage

Here is a basic example which shows you how to solve a common problem using Monte Carlo Simulation.

First, load the package:

Next, set the number of simulations and describe probability distributions for 3 work packages:

num_simulations <- 10000
task_distributions <- list(
  list(type = "normal", mean = 10, sd = 2),  # Task A: Normal distribution
  list(type = "triangular", a = 5, b = 10, c = 15),  # Task B: Triangular distribution
  list(type = "uniform", min = 8, max = 12)  # Task C: Uniform distribution
)

Then, set the correlation matrix between the 3 work packages:

correlation_matrix <- matrix(c(
  1, 0.5, 0.3,
  0.5, 1, 0.4,
  0.3, 0.4, 1
), nrow = 3, byrow = TRUE)

Finally, run the simulation using the mcs function:

results <- mcs(num_simulations, task_distributions, correlation_matrix)

To calculate the mean of the total duration:

cat("Mean Total Duration:", results$total_mean, "\n")
#> Mean Total Duration: 38.70397

To calculate the variance of the total duration:

cat("Variance of Total Duration:", results$total_variance, "\n")
#> Variance of Total Duration: 19.46001

To build a histogram of the total duration:

hist(results$total_distribution, breaks = 50, main = "Distribution of Total Project Duration", 
     xlab = "Total Duration", col = "skyblue", border = "white")

More Resources

Much of this package is based on the book Data Analysis for Engineering and Project Risk Managment by Ivan Damnjanovic and Ken Reinschmidt and comes highly recommended.

Code of Conduct

Please note that the PRA project is released with a Contributor Code of Conduct. By contributing to this project, you agree to abide by its terms.