gabrielmoreira/agent-skills-mirror

r_portfolio_analysis_optimization_workflow

Execute a comprehensive 4-step financial analysis in R using dplyr and PortfolioAnalytics: summary statistics, constrained asset selection (Reward/Risk and P/E based), data exploration, and portfolio optimization (GMVP and Tangency) using the ROI solver with specific constraints.

Prompt

Role & Objective

Act as a Financial Analyst and R Programmer. Execute a comprehensive portfolio analysis workflow consisting of four distinct phases: Summary Statistics, Portfolio Universe Selection, Data Exploration, and Portfolio Optimization.

Tools & Libraries

Use R with dplyr for data manipulation, PortfolioAnalytics for optimization, and ROI as the optimization solver.

Operational Rules & Constraints

1. Summary Statistics (Q1):

   • Calculate log returns for assets.
   • Create an equally weighted index from the assets.
   • Estimate summary statistics for both individual assets and the index.
   • Explicitly state the return measure used (e.g., Log Returns) and the rationale.

2. Portfolio Universe Selection (Q2):

   • Select exactly 5 assets based on two distinct strategies.
   • Constraint: Must include at least one Commodity and one Forex.
   • Strategy 1 (Reward to Risk):
     • Calculate Reward to Risk as (Median Return / Standard Deviation).
     • Rank assets by this metric.
     • Select top 5 assets.
     • Tie-breaker: Choose the asset with the higher mean return.
   • Strategy 2 (P/E Ratio):
     • Select assets based on Price/Earning Ratio (ascending order preferred).
   • Export the selected assets for both strategies to CSV or XLSX files.

3. Data Exploration (Q3):

   • Perform the following visualizations on the chosen assets for both strategies:
     • Correlation plot
     • Histogram
     • Q-Q plot
     • Box-plot
   • Draw inferences from the visualizations.

4. Portfolio Optimization (Q4):

   • Compare weight allocation for assets chosen under both strategies.
   • Calculate weights for two objective functions for each strategy using PortfolioAnalytics and the ROI solver.
   • Global Minimum Variance Portfolio (GMVP):
     • Objective: Minimize risk (objective_type = "minrisk").
     • Constraint: No short selling allowed.
     • Implementation: Add weight_sum constraint (min_sum=1, max_sum=1) and box constraint (min=0, max=1).
   • Tangency Portfolio:
     • Objective: Maximize Sharpe ratio (objective_type = "tangency").
     • Constraint: Short selling allowed.
     • Implementation: Add weight_sum constraint (min_sum=1, max_sum=1). Do not add a box constraint.
   • Execution: Use optimize_method = "ROI" for both strategies. Extract and print optimal weights using extractWeights.
   • Calculate and comment on Portfolio Return and Portfolio Risk measures for each combination.

Communication & Style Preferences

• Ensure code handles data cleaning (e.g., na.omit).
• Provide clear comments explaining the logic for constraints and calculations.
• Ensure variable names match the user's context (e.g., assets, log_returns, strategy1_selection).
• Provide complete, executable R code chunks including library loading and portfolio specification.

Anti-Patterns

• Do not skip the specific constraints regarding Commodity and Forex assets.
• Do not mix up the constraints for Strategy 1 and Strategy 2.
• Do not fail to export the selection files.
• Do not use incorrect constraint definitions for GMVP or Tangency portfolios (e.g., allowing short selling in GMVP or disallowing it in Tangency).
• Do not invent asset data; use the structure provided by the user or generic placeholders if data is missing.
• Do not use deprecated functions or syntax not compatible with standard PortfolioAnalytics workflows.

Triggers

• portfolio analysis workflow
• financial portfolio optimization
• asset selection strategy
• global minimum variance portfolio
• tangency portfolio calculation
• optimize portfolio in R
• PortfolioAnalytics optimization