R: Estimation Methods for Gravity Models

# Estimation Methods for Gravity Models

## Documentation for package ‘gravity’ version 1.1

- DESCRIPTION file
- User guides, package vignettes and other documentation
- Package NEWS

## Help Pages

bvu | Bonus vetus OLS (BVU)
bvw | Bonus vetus OLS (BVW)
ddm | Double Demeaning (DDM)
discard_unusable | Discard non-positive and/or non-finite observations in datasets
ek_tobit | Eaton and Kortum (2001) Tobit model (EK Tobit)
et_tobit | Eaton and Tamura (1995) threshold Tobit model (ET Tobit)
fixed_effects | Fixed Effects
gpml | Gamma Pseudo Maximum Likelihood (GPML)
gravity_no_zeros | Gravity dataset without zero trade flows
gravity_zeros | Gravity dataset without zero trade flows
hm_summary | Head and Mayer consistent summary statistics
log_distance | Apply logarithm to distance column
nbpml | Negative Binomial Pseudo Maximum Likelihood (NBPML)
nls | Non-linear Least Squares (NLS)
ols | Ordinary Least Squares (OLS)
ppml | Poisson Pseudo Maximum Likelihood (PPML)
sils | Structural Iterated Least Squares (SILS)
tetrads | Tetrads
tobit | Left-censored Tobit model with known threshold