Animal Density Analysis in Brazil: Population-Livestock Relationships and Projections 2014-2034

# Animal Density Analysis in Brazil: Population-Livestock Relationships and Projections (2014-2034) ## OverviewThis computational repository provides a complete analytical pipeline for examining animal density dynamics in Brazil from 2014 to 2024, with projections extending to 2034. The analysis quantifies the relationship between human population growth and livestock herd expansion, with specific focus on cattle, pigs, and poultry populations at the national level. ## Key Features- **Comprehensive Data Pipeline**: Automated processing of Brazilian Institute of Geography and Statistics (IBGE) data, including Municipal Livestock Production (PPM) and population estimates- **Econometric Analysis**: Elasticity models estimating animal-population growth relationships using ordinary least squares regression- **Multivariate Techniques**: Principal Component Analysis (PCA) for dimensionality reduction and k-means clustering for pattern identification- **Future Projections**: Compound Annual Growth Rate (CAGR) based forecasts for 2025-2034- **Reproducible Workflow**: Sequential R scripts (00-05) with example data and detailed documentation- **Publication-Ready Outputs**: High-resolution visualizations and formatted analysis results ## MethodologyThe analysis follows a six-step sequential approach: 1. **Environment Setup** (`00_setup.R`): Package installation and directory structure2. **Data Processing** (`01_data_processing.R`): IBGE data ingestion, cleaning, and density calculation (animals per capita)3. **Elasticity Analysis** (`02_elasticity_analysis.R`): log-log regression models: log(animals) ~ log(population)4. **Multivariate Analysis** (`03_multivariate_analysis.R`): PCA on density variables and k-means clustering5. **Future Projections** (`04_projections.R`): CAGR calculation and 10-year projections6. **Visualization** (`05_visualization.R`): ggplot2 generation of temporal trends and projection figures ## Key Findings- **High Elasticity**: Brazilian animal populations grow at approximately 1.85 times the rate of human population growth (2014-2024)- **Density Increase**: Projected animal density rises from ~10.6 (2024) to ~11.5 animals per capita (2034)- **Cluster Patterns**: Two distinct clusters identified in animal density composition- **Species Variations**: Differential elasticity across cattle, pig, and poultry sectors ## Repository Structure Repository Structure analise-densidade-animal/├── code/ # R scripts (00-05 sequence)├── documentation/ # Data dictionary, methodology, replication guide├── 00_raw_data/ # Placeholder for IBGE raw data├── 01_processed_data/ # Processed datasets├── 02_analysis_outputs/ # Analysis results (elasticity, PCA scores, projections)├── 03_figures/ # Generated visualizations├── README.md # Project overview├── LICENSE # CC BY 4.0├── .gitignore # Version control settings└── run_analysis.R # Master execution script ## Usage Instructions### Quick Start```r# Execute complete analysis pipelinesource("run_analysis.R") # 1. Environment setupsource("code/00_setup.R") # 2. Data processing (creates example data)source("code/01_data_processing.R") # 3. Elasticity analysissource("code/02_elasticity_analysis.R") # 4. Multivariate analysissource("code/03_multivariate_analysis.R") # 5. Future projectionssource("code/04_projections.R") # 6. Visualization generationsource("code/05_visualization.R")