This repository is to share the R data and code replicating the main results (Table 3 and Table S2) published in Yun and Gramig (JAAE 2021). Modifying the code properly, all results in Yun and Gramig (2022) are reproducible.
GitHub Repository maintained by: Seong Yun
Department of Agricultural Economics
Mississippi State University
seong.yun@msstate.edu
https://sites.google.com/site/yunsd2004/
Last updated: Oct. 11, 2021
Please cite this publication;
To cite Yun and Gramig (2022) in publications use:
Yun, Seong D. and Benjamin M. Gramig, 2022, "Spatial Panel Model of Crop Yield Response
to Weather: Econometric Specification Strategies and Prediction Performance,"
Journal of Agricultural and Applied Economics, 54(1): 53-71.
A BibTeX entry for LaTeX users is
@article{,
title = {Spatial Panel Model of Crop Yield Response to Weather: Econometric Specification Strategies and Prediction Performance},
author = {Seong D. Yun and Benjamin M. Gramig},
year = {2022},
journal = {Journal of Agricultural and Applied Economics},
volume = {54},
issue = {1},
pages = {53--71}
}Download the R-file from this repository into yoour working directory.
## In R
download.file("https://raw.github.com/ysd2004/spatialcropyieldJAAE/main/regCode.R", "regCode.R")In regCode.R, it is implementable to download the regression data and perform the regression results in Table 3 and Table S2. Modifying the regression codes, all regression results in Yun and Gramig (2022) are reproducible.
To download regData.rda and regCode.R files directly:
regdata.rda includes the following variables.
| Column No. | Variable Name | Description |
|---|---|---|
| 1 | stco | State and County FIPS code |
| 2 | year | year |
| 3 | corn | corn yield (bu/ac) |
| 4 | ppt | precipitation (mm) |
| 5 | ppt_sq | ppt squared (ppt x ppt) |
| 6 | t | time trend ( 1 = 1981) |
| 7 | t_sq | time trend squared (t x t) |
| 8 | whc | area weighted soil water holding capacity (cm/cm3) |
| 9 | om | organic matter (%) |
| 10 | kffactor | soil erosion K-factor |
| 11 | spH | soil pH |
| 12 | gdd8to32 | growing degree days (GDDs) for 8 deg C ~ 32 deg C |
| 13 | gdd34 | extreem growing degree days (GDDs) for 34 deg C or above |
| 14 | gdd34rt | sqaure root of gdd34 |
| 15 - 22 | xit1 - xit8 | 8th order Chebyshev polynomials |
| 23 | yit | log(corn + 1) |
| 24 | gdd8to32_sq | gdd8to32 sqaured (gdd8to32 x gdd8to32) |
| 25 - 37 | wgdd8to32 - wxit8 | spatially lagged X variables |