close #80, data_is has to be define as an input variable of the GREGWT function
close #80, data_is has to be define as an input variable of the GREGWT function

modumont/spatial-microsim-book,jojo-/spatial-microsim-book,Robinlovelace/spatial-microsim-book,emunozh/spatial-microsim-book,emunozh/spatial-microsim-book,Robinlovelace/spatial-microsim-book,modumont/spatial-microsim-book,majazaloznik/spatial-microsim-book,Robinlovelace/spatial-microsim-book,jojo-/spatial-microsim-book,modumont/spatial-microsim-book,richardellison/spatial-microsim-book,richardellison/spatial-microsim-book,majazaloznik/spatial-microsim-book