${data.title[0]}${labels[j] && ` (${labels[j]})`} ${data.title[1]}${labels[i] && ` (${labels[i]})`}

2a:null 2b:["$","title",null,{"children":"Bivariate Choropleth Mapping | emilyschmitt | Observable"}] 30:T44c,legend = () => { const k = 24; const arrow = DOM.uid(); return svg` ${d3.cross(d3.range(n), d3.range(n)).map(([i, j]) => svg` ${data.title[0]}${labels[j] && ` (${labels[j]})`} ${data.title[1]}${labels[i] && ` (${labels[i]})`} `)} ${data.title[0]} ${data.title[1]} `; }31:[{"id":"ddf04b75162ffbddc646116cdf81a903d72db3f740a57f733e38111bdcbaf9ae7cc9b4726ff0af05b17d4aaa327dcf900dab6eb3409ffd9bee0283ed1e41b9a9","href":"https://static.observableusercontent.com/files/ddf04b75162ffbddc646116cdf81a903d72db3f740a57f733e38111bdcbaf9ae7cc9b4726ff0af05b17d4aaa327dcf900dab6eb3409ffd9bee0283ed1e41b9a9","name":"kansas.csv","type":"text/csv","lastModified":1586825204251.724,"size":37389},{"id":"38c5e50463a0747445c04b08139f427c5dabecea43a2c2bf82c3fcd224c9f19d06914421d941ded4554d7a553f71f85746d34bc21b4330275b91e8fa38f32ef0","href":"https://static.observableusercontent.com/files/38c5e50463a0747445c04b08139f427c5dabecea43a2c2bf82c3fcd224c9f19d06914421d941ded4554d7a553f71f85746d34bc21b4330275b91e8fa38f32ef0","name":"kansas.json","type":"application/json","lastModified":1586825282475.115,"size":130966}] 2e:{"id":"01384c63b654ba58","slug":"bivariate-choropleth-mapping","title":"Bivariate Choropleth Mapping","thumbnail":"a37a7e8d519a086560be9d292723847ec4e3d70443bf278db7887f889c7fc529","access_level":"public","create_time":"$D2020-04-13T23:08:08.598Z","update_time":"$D2020-04-14T01:28:56.384Z","view_time":null,"first_public_time":"$D2020-04-14T02:12:21.171Z","fork":{"id":"de68dfd4266dab75","slug":"bivariate-choropleth-mapping","title":"Bivariate Choropleth Mapping","owner":{"id":"1522f7962f5f1185","login":"caglarkoylu","name":"Caglar Koylu"}},"stars":0,"starred":false,"owner":{"type":"team","id":"7e7a7299f49db51a","login":"emilyschmitt","name":"","avatar_url":"https://avatars-next.observableusercontent.com/c03557a02989e991ca5d80d202331bab98cbac5d3401dca7e8d2635c97e6cc89","tier":"starter_2024"},"version":533,"publish_version":533,"role":null,"authored":false,"authors":[{"type":"individual","id":"ae4ddb89cf4d4764","login":"emilyschmitt","name":"","avatar_url":"https://avatars-next.observableusercontent.com/c03557a02989e991ca5d80d202331bab98cbac5d3401dca7e8d2635c97e6cc89","tier":null}],"members":[{"type":"individual","id":"ae4ddb89cf4d4764","login":"emilyschmitt","name":"","avatar_url":"https://avatars-next.observableusercontent.com/c03557a02989e991ca5d80d202331bab98cbac5d3401dca7e8d2635c97e6cc89","tier":null,"role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"subscribed":null,"forks":1,"collection":null,"type":"notebook","body":{"title":"Bivariate Choropleth Mapping","cells":[{"id":0,"value":"md`# Bivariate Choropleth Mapping\n\nAverage Household Size and % Renter Occupied by Census Tracts of Chicago Metropolitan Area. Data: [Census 2010]`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":194,"value":"viewof colors = {\n const form = html`

color scheme`;\n form.i.selectedIndex = 1;\n form.oninput = () => form.value = schemes[form.i.selectedIndex].colors;\n form.oninput();\n return form;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":14,"value":"chart = {\n const svg = d3.create(\"svg\")\n .attr(\"viewBox\", [0, 0, width, height]);\n\n svg.append(legend)\n .attr(\"transform\", \"translate(670,250)\");\n\n svg.append(\"g\")\n .selectAll(\"path\")\n .data(topojson.feature(polygons, polygons.objects.kansas)\n .join(\"path\")\n .attr(\"fill\", d => color(data.get(d.properties[idAttribute])))\n .attr(\"d\", path)\n .append(\"title\")\n .text(d => `${d.properties[idAttribute]}, ${format(data.get(d.properties[idAttribute]))}`);\n\n return svg.node()\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":359,"value":"// http://www.joshuastevens.net/cartography/make-a-bivariate-choropleth-map/\nschemes = [\n {\n name: \"RdBu\", \n colors: [\n \"#e8e8e8\", \"#e4acac\", \"#c85a5a\",\n \"#b0d5df\", \"#ad9ea5\", \"#985356\",\n \"#64acbe\", \"#627f8c\", \"#574249\"\n ]\n },\n {\n name: \"BuPu\", \n colors: [\n \"#e8e8e8\", \"#ace4e4\", \"#5ac8c8\",\n \"#dfb0d6\", \"#a5add3\", \"#5698b9\", \n \"#be64ac\", \"#8c62aa\", \"#3b4994\"\n ]\n },\n {\n name: \"GnBu\", \n colors: [\n \"#e8e8e8\", \"#b5c0da\", \"#6c83b5\",\n \"#b8d6be\", \"#90b2b3\", \"#567994\",\n \"#73ae80\", \"#5a9178\", \"#2a5a5b\"\n ]\n },\n {\n name: \"PuOr\", \n colors: [\n \"#e8e8e8\", \"#e4d9ac\", \"#c8b35a\",\n \"#cbb8d7\", \"#c8ada0\", \"#af8e53\",\n \"#9972af\", \"#976b82\", \"#804d36\"\n ]\n }\n]","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":216,"value":"labels = [\"low\", \"\", \"high\"]","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":207,"value":"n = Math.floor(Math.sqrt(colors.length))","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":209,"value":"x = d3.scaleQuantile(Array.from(data.values(), d => d[0]), d3.range(n))","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":204,"value":"y = d3.scaleQuantile(Array.from(data.values(), d => d[1]), d3.range(n))","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":486,"value":"path = d3.geoPath().projection(projection)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":462,"value":"//Rotate the map sets the longitude of origin for our UTM projection.\nprojection = d3.geoTransverseMercator().rotate([87,0]).fitExtent([[10, 10], [width, height]], polygon_features);","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":430,"value":"polygon_features = topojson.feature(polygons, polygons.objects.kansas)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":467,"value":"data = Object.assign(new Map(d3.csvParse(await FileAttachment(\"kansas.csv\").text(), ({FIPS, WHITE, MARHH_NO_C}) => [+WHITE, +MARHH_NO_C])), {title: [\"White\", \"% Married with No Children\"]})","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":483,"value":"idAttribute = \"FIPS\"","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":8,"value":"polygons = FileAttachment(\"kansas.json\").json()","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":427,"value":"height = 610","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":424,"value":"width = 875","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":480,"value":"$30","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":477,"value":"color = {\n return value => {\n if (!value) return \"#ccc\";\n let [a, b] = value;\n return colors[y(b) + x(a) * n];\n };\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":513,"value":"formatNum = d3.format(\".1f\")","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":474,"value":"format = (value) => {\n if (!value) return \"N/A\";\n let [a, b] = value;\n return `${a} ${data.title[0]}${labels[x(a)] && ` (${labels[x(a)]})`}\n${formatNum(b)} ${data.title[1]}${labels[y(b)] && ` (${labels[y(b)]})`}`;\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":6,"value":"topojson = require(\"topojson-client@3\")","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":3,"value":"d3 = require(\"d3@5\")","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"}],"files":"$W31","stdlib":"1","titling":"auto"}} 2f:"$2e:body"