importFrom(methods, as, new)
importFrom(stats, model.matrix, model.response, aggregate,  coef, coefficients, fitted, lm, model.extract, na.fail, nlminb, pchisq, pnorm, printCoefmat, quantile, residuals, terms)
importFrom(utils, read.table, write.table)
import(nlme)
import(spdep)
import(Matrix)
importFrom(sp, spDists)

export(distance,gstslshet,read.gwt2dist,stslshac,summary.sphet, print.sphet, listw2dgCMatrix,impacts.gstsls,spreg, circular)



S3method(print, sphet)
S3method(summary, sphet)
S3method(print, summary.sphet)
S3method(impacts, gstsls)