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<!DOCTYPE html>
<html lang="en">
<head>
<title> 2010 Differential Privacy Demo for Vermont </title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta charset="utf-8">
<link rel="stylesheet" href="https://unpkg.com/tachyons/css/tachyons.min.css">
<link href="https://fonts.googleapis.com/css?family=Poppins:300&display=swap" rel="stylesheet">
</head>
<body>
<section class="w-100 pv2 ph2">
<article class="bb bw1">
<h1 class="f2 mw8 center">
How Differential Privacy will impact Vermont Data
</h1>
</article>
<article class="mw8 f4 center ph2 pv4">
<p>
To protect the confidentiality of 2020 Census respondents,
the US Census Bureau plans to use a "differential privacy" framework;
it is a statistical technique to protect individual data
from reidentification or reconstruction. The data users community is
concerned about the potential impact of this approach on the scope and
quality of census data products.
</p>
<p>
The Census Bureau has shared files<a href="https://www.nhgis.org/differentially-private-2010-census-data" class="link blue dim">
(see IPUMS joint data release)</a> that show the impact of differential privacy on 2010 decennial data
and the CTData Collaborative developed this interface to compare the original 2010 decennial data with the differentially private 2010 datasets.
The Vermont Center for Geographic Information (VCGI) has modified the original version of this page developed for Connecticut with data for Vermont municipalities.
</p>
<p class="bg-light-yellow pa2 f5 lh-copy">
From the US Census Bureau: <i>"Feedback on the 2010 Demonstration
Products can be submitted to
<a href="mailto:dcmd.2010.demonstration.data.products@census.gov?Subject=2010 Demonstration Products Feedback" class="link blue dim">dcmd.2010.demonstration.data.products@census.gov</a>.
We are accepting feedback through Summer 2020, though earlier is better as work on
improving and optimizing the Disclosure Avoidance System for greater accuracy is ongoing."</i>
</p>
</article>
</section>
<section class="mw8 center bg-near-white cf black">
<h2 class="tab f2 w-50 fl bl bt br bw1 ph4 pv3 mb0 mt0 dim">Tables</h2>
<h2 class="tab f2 w-50 fl ph4 pv3 bb bw1 mt0 dim mb0">Variables</h2>
</section>
<!-- Tables tab -->
<section id="TablesTab" class="tab-contents mw8 center bg-near-white black cf ph4 pv4">
<p class="f4">
Select a census table from the dropdown below to see how differential privacy would change
the values of variables in that table for a particular Vermont town.
</p>
<p>
The same data is displayed in a bar chart, as well as the sortable table underneath.
Generally, smaller communities are affected the most.
<b>Before DP</b> refers to 2010 Census data;
<b>After DP</b> refers to what the value would be if DP were applied.
</p>
<div class="w-100 w-50-ns fl cf">
<h3 class="f3">1. Select a table</h3>
<select id="tables" class="w-75"></select>
</div>
<div class="w-100 w-50-ns fl cf">
<h3 class="f3">2. Select a town</h3>
<select id="towns" class="w-75"></select>
</div>
<canvas id="chart1" class="fl mv5 w-100" height="600"></canvas>
<div class="w-100 mv0 fl">
<table id="table1" class="w-100"></table>
</div>
</section>
<!-- Variables tab -->
<section id="VariablesTab" class="tab-contents mw8 center bg-near-white black cf ph4 pv4">
<p class="f4">
Select a census variable from the dropdown below to see how differential privacy would affect
that variable in all Vermont towns. Generally, smaller communities
are affected the most.
</p>
<p>
<b>Before</b> refers to 2010 Census data;
<b>After</b> refers to what the value would be if DP were applied.
</p>
<div class="cf w-100">
<div class="w-100 w-50-ns fl cf">
<h3 class="f3">1. Select a table</h3>
<select id="tables2" class="w-75"></select>
</div>
<div class="w-100 w-50-ns fl cf">
<h3 class="f3">2. Select a variable</h3>
<select id="variables" class="w-75"></select>
</div>
</div>
<div class="w-100 mt4 mb0 fl">
<div class="pv2 mv2 ph2 bg-lightest-blue">
<b>Town population</b>
<label class="mr2 ml2">
<input type="radio" name="townsize" value="-1" checked> All
</label>
<label class="mr2">
<input type="radio" name="townsize" value="0-1000"> ≤ 1,000
</label>
<label class="mr2">
<input type="radio" name="townsize" value="1001-2000"> ≤ 1,001-2,000
</label>
<label class="mr2">
<input type="radio" name="townsize" value="2001-5000"> 2,001–5,000
</label>
<label class="mr2">
<input type="radio" name="townsize" value="5001-10000"> 5,001–10,000
</label>
<label class="mr2">
<input type="radio" name="townsize" value="10000-9999999999"> 10,000+
</label>
</div>
<table id="table2" class="w-100"></table>
</div>
</section>
<!-- Additional information -->
<section class="mw8 center mt5">
<h3>
Additional reading
</h3>
<ul class="list">
<li class="pv2">
University of Virginia:
<a href="./files/CensusDistortionProgram_VAGovernor_2020-01-23.pdf" class="link blue dim">
Concerned letter to Virginia Governor
</a>
</li>
<li class="pv2">
The New York Times:
<a href="https://www.nytimes.com/interactive/2020/02/06/opinion/census-algorithm-privacy.html" class="link blue dim">
Changes to the Census Could Make Small Towns Disappear</a>.
An algorithm intended to keep responses anonymous could erase minorities and rural
communities — and deprive them of federal funding
</li>
<li class="pv2">
CT Data Collaborative:
<a href="http://ctdata.org/blog/whats-changing-with-census-data-availability-differential-privacy-what-is-it-and-why-it-matters-for-census-2020/" class="link blue dim">
Blog Post</a>.
</li>
<li class="pv2">
VT Digger:
<a href="https://vtdigger.org/2020/02/23/census-change-could-inaccurately-report-small-vermont-community-counts/" class="link blue dim">
Census change could inaccurately report small Vermont community counts</a>.
</li>
</ul>
</section>
<footer class="bt bw1 mt5 pv4">
<section class="mw8 center">
<p>
This tool was developed by <a href="http://ctdata.org" class="link blue dim" target="_blank">
CTData Collaborative</a> in December 2019 for demonstration purposes and modified by <a href="https://vcgi.vermont.gov" class="link blue dim" target="_blank">
VCGI</a> with data for Vermont.
Data by IPUMS NHGIS, University of Minnesota,
<a href="https://www.nhgis.org" class="link blue dim" target="_blank">www.nhgis.org</a>, accessed December 6, 2019, updated February 20, 2020. <a href="https://github.com/VCGI/dp2010" class="link blue dim">
Code available in VCGI GitHub repository.</a>
</p>
</section>
</footer>
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