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<h1>Retrieve weekly state-level ILI indicators per-state for a given season</h1>
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<div class="hidden name"><code>ili_weekly_activity_indicators.Rd</code></div>
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</div>
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<div class="ref-description">
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<p>Retrieve weekly state-level ILI indicators per-state for a given season</p>
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</div>
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<pre class="usage"><span class='fu'>ili_weekly_activity_indicators</span>(<span class='kw'>years</span> <span class='kw'>=</span> <span class='kw'>NULL</span>)</pre>
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<h2 class="hasAnchor" id="arguments"><a class="anchor" href="#arguments"></a>Arguments</h2>
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<table class="ref-arguments">
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<colgroup><col class="name" /><col class="desc" /></colgroup>
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<tr>
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<th>years</th>
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<td><p>a vector of years to retrieve data for (i.e. <code>2014</code> for CDC
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flu season 2014-2015). CDC has data for this API going back to 2008
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and up until the current, active flu season.
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Default value (<code>NULL</code>) means retrieve <strong>all</strong> years. NOTE: if you
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happen to specify a 2-digit season value (i.e. <code>57</code> == 2017-2018)
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the function is smart enough to retrieve by season ID vs convert that
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to a year.</p></td>
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</tr>
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</table>
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<h2 class="hasAnchor" id="note"><a class="anchor" href="#note"></a>Note</h2>
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<p>These statistics use the proportion of outpatient visits to healthcare providers
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for influenza-like illness to measure the ILI activity level within a state. They do
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not, however, measure the extent of geographic spread of flu within a state. Therefore,
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outbreaks occurring in a single city could cause the state to display high activity levels.<br />
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<br />
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Data collected in ILINet may disproportionately represent certain populations within
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a state, and therefore may not accurately depict the full picture of influenza activity
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for the whole state.<br />
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<br />
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All summary statistics are based on either data collected in ILINet, or reports from
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state and territorial epidemiologists. Differences in the summary data presented by
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CDC and state health departments likely represent differing levels of data completeness
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with data presented by the state likely being the more complete.</p>
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<h2 class="hasAnchor" id="references"><a class="anchor" href="#references"></a>References</h2>
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<ul>
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<li><p><a href='https://gis.cdc.gov/grasp/fluview/main.html'>ILI Activity Indicator Map Portal</a></p></li>
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</ul>
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<h2 class="hasAnchor" id="examples"><a class="anchor" href="#examples"></a>Examples</h2>
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<pre class="examples"><span class='co'># NOT RUN {</span>
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<span class='no'>iwai</span> <span class='kw'><-</span> <span class='fu'>ili_weekly_activity_indicators</span>(<span class='fl'>2016</span>)
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<span class='co'># }</span></pre>
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<h2>Contents</h2>
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<ul class="nav nav-pills nav-stacked">
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<li><a href="#arguments">Arguments</a></li>
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<li><a href="#note">Note</a></li>
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<li><a href="#references">References</a></li>
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<li><a href="#examples">Examples</a></li>
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<p>Developed by Bob Rudis.</p>
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