Updates for #4

Former-commit-id: 45f31db

.gitignore

@@ -23,3 +23,4 @@ vignettes/crashes.Rds
 README_files/figure-html/
 README_files/libs
 docs
+GCCSA_2016_AUST_New.geojson

vignettes/references.bib

@@ -76,3 +76,20 @@ @article{dennett_estimating_2012
 	url = {http://www.bartlett.ucl.ac.uk/casa/publications/working-paper-181},
 	note = {Citation Key: dennett{\_}estimating{\_}2012}
 }
+
+@article{dennett_modelling_2018,
+	title = {Modelling population flows using spatial interaction models},
+	author = {Dennett, Adam},
+	year = {2018},
+	month = {11},
+	date = {2018-11-11},
+	journal = {Australian Population Studies},
+	pages = {33--58},
+	volume = {2},
+	number = {2},
+	doi = {10.37970/aps.v2i2.38},
+	url = {https://www.australianpopulationstudies.org/index.php/aps/article/view/38},
+	note = {Number: 2
+Citation Key: dennett{\_}modelling{\_}2018},
+	langid = {en}
+}

vignettes/si.Rmd

@@ -5,6 +5,7 @@ vignette: >
   %\VignetteIndexEntry{Tutorial: spatial interaction models with R}
   %\VignetteEngine{knitr::rmarkdown}
   %\VignetteEncoding{UTF-8}
+bibliography: references.bib
 ---
 
 ```{r, include = FALSE}
@@ -21,4 +22,17 @@ See the package's [README](https://robinlovelace.github.io/si/) for instructions
 library(si)
 ```
 
-This tutorial builds on @dennett_estimating_2012's pioneering tutorial.
+This tutorial builds on @dennett_modelling_2018 (which in turn builds on @dennett_estimating_2012's pioneering [reproducible](https://github.com/adamdennett/SIModelling/blob/SIModelling-Edits/SimAus2.Rmd) tutorial on SIMs with R).
+We start by importing open access data representing movement between zones in Australia (thanks to Adam Dennett for making the files accessible):
+
+```{r}
+u1 = "https://www.dropbox.com/s/0fg80nzcxcsybii/GCCSA_2016_AUST_New.geojson?raw=1"
+aus = sf::read_sf(u1)
+u2 = "https://www.dropbox.com/s/wi3zxlq5pff1yda/AusMig2011.csv?raw=1"
+od_migration_original = read.csv(u2)
+```
+
+```{r, echo=FALSE, eval=FALSE}
+sf::write_sf(aus, "GCCSA_2016_AUST_New.geojson")
+piggyback::pb_upload("GCCSA_2016_AUST_New.geojson")
+```