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Quantifying interactive effects of fire and precipitation regimes on catchment biogeochemistry of aridlands

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Quantifying interactive effects of fire and precipitation regimes on catchment biogeochemistry of aridlands

Project Summary

PIs:

  • Tamara Harms, Associate Professor, Department of Biology & Wildlife and Institute of Arctic Biology, University of Alaska Fairbanks
  • Heili Lowman, Department of Natural Resources and Environmental Science, University of Nevada, Reno
  • Stevan Earl, Information Manager for the Central Arizona-Phoenix Long-Term Ecological Research (CAP LTER) project

Script Explanations

  • In the models folder, the following STAN scripts are available for progressively built out model structures:
  1. STAN_lm_template.stan - Provides a basic linear model with the structure of y = mx + b.
  2. STAN_lm_prepost_template.stan - Splits observations into pre- and post-fire and estimates CQ slopes before and after.
  3. STAN_lm_delta_template.stan - Uses pre- and post-fire CQ slopes to calculate delta, the change in slopes, as a derived variable.
  4. STAN_lm_delta_unified_template.stan - Unifies model structure to estimate all parameters in a single model structure, both pre- and post-fire.
  5. STAN_lm_hierarchical_template.stan - Estimates all parameters in a hierarchical structure (at site- and universal-level). UNDER DEVELOPMENT
  • In the model_fitting folder, the STAN_dev_script.R works through prepping data and fitting all the model structures above.

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