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This uses [data](https://observablehq.com/@tophtucker/covid-tracking-project-data) from [The COVID Tracking Project](https://covidtracking.com/).\n\n---`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":1014,"value":"viewof statistic = radio({\n title: 'Statistic',\n options: stats,\n value: 'positiveIncrease',\n description: \"Defaults to positiveIncrease, i.e. daily new cases.\"\n})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":1020,"value":"viewof smoothing = slider({\n min: 1,\n max: 14,\n step: 1,\n value: 7,\n title: \"Smoothing\",\n format: v => `Last ${v} day${v > 1 ? \"s\" : \"\"}`,\n description: \"Simple moving average (trailing).\"\n})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":1026,"value":"viewof highlights = checkbox({\n title: \"Highlights\",\n description: \"Make these states bright.\",\n options: keys,\n value: [\"CA\", \"WA\", \"NY\", \"MA\", \"NJ\"]\n})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":301,"value":"viewof threshold = slider({\n min: 1,\n max: 100,\n step: 1,\n value: 10,\n title: \"Threshold\",\n description: \"Align series to show days since this threshold.\"\n})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":1036,"value":"md`---`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":109,"value":"$35","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":584,"value":"style = html``","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":2,"value":"// x0: initial value\n// T: doubling time\nexp = (x0, T) => t => x0 * 2 ** (t / T)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":405,"value":"expSolveForX = (x0, T) => y => (T * Math.log(y / (x0 / 2))) / Math.LN2 - T","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":6,"value":"curves = d3.range(1, 8).map(T => ({\n T,\n x0: threshold,\n data: range(0, domain.length, 1).map((d, i) => [i, exp(threshold, T)(d)])\n}))","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":63,"value":"domain = Array.from(data.get(keys[0]).keys())","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":245,"value":"latest = domain[domain.length - 1]","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":116,"value":"keys = Array.from(data.keys())","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":592,"value":"series = keys.map(key => ({\n key,\n latest: data.get(key).get(latest),\n color: hsl(hues.get(key)),\n highlight: highlights.includes(key),\n offset: xOffsets.get(key),\n data: domain.map((d, i) => ({\n date: dateParse(d),\n i,\n di: i - xOffsets.get(key),\n value: data.get(key).get(d)\n }))\n}))","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":29,"value":"data = transformData({\n statistic,\n smoothing\n})","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":294,"value":"xOffsets = mapEach(map =>\n Array.from(map.values()).findIndex(d => d > threshold)\n)(data)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":923,"value":"hasOffset = ({ offset }) => offset !== -1","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":1052,"value":"minOffset = d3.min(Array.from(xOffsets.values()).filter(d => d !== -1))","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":89,"value":"md`---`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":111,"value":"line = d3\n .line()\n .x(d => x(d[0]))\n .y(d => y(d[1]))\n .defined(d => logValid(d[1]))","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":374,"value":"lineTrunc = d => line(d.filter(([i, d]) => d < 20 * y.domain()[1]))","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":1057,"value":"x.domain()","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":94,"value":"x = d3\n .scaleLinear()\n .domain([0, domain.length - minOffset + 1])\n .range([margin.left, width - margin.right])","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":100,"value":"y = d3\n .scaleLog()\n .domain([threshold, max(data) * 1.1])\n .range([height - margin.bottom, margin.top])","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":106,"value":"height = width / 2","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":232,"value":"max = map =>\n d3.max(\n d3\n .merge(\n Array.from(map, ([key, value]) =>\n Array.from(value, ([key, value]) => value)\n )\n )\n .filter(logValid)\n )","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":139,"value":"hues = new Map(keys.map(d => [d, Math.floor(Math.random() * 360)]))","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":602,"value":"hsl = hue => `hsl(${hue}, 70%, 30%)`","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":104,"value":"valid = d => d !== null && d !== Infinity && d !== -Infinity && !isNaN(d)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":807,"value":"logValid = d => valid(d) && d !== 0","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":96,"value":"margin = ({ top: 10, right: 40, bottom: 20, left: 10 })","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":825,"value":"clip = DOM.uid(\"clip\")","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":40,"value":"// inclusive!\nrange = (min, max, step) => [...d3.range(min, max, step), max]","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":7,"value":"d3 = require(\"d3@5\")","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":27,"value":"import { transformData, dateParse, stats } from \"8961aecb496ce269\"","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":295,"value":"import { mapEach } from \"@tophtucker/scrapbook\"","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":1016,"value":"import { radio, slider, checkbox } from \"@jashkenas/inputs\"","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"}],"files":"$W36","stdlib":"1","titling":"auto"}} 34:"$33:body"