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<li class="nav-item" data-bs-level="1"><a href="#visual-tutorial-one-univariate-decomposition" class="nav-link">Visual tutorial: one univariate decomposition</a>
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<h1 id="visual-tutorial-one-univariate-decomposition">Visual tutorial: one univariate decomposition</h1>
<p>This walkthrough is the shortest path from a raw series to interpretable
figures.</p>
<h2 id="goal">Goal</h2>
<p>Use one method on one synthetic series and inspect:</p>
<ul>
<li>the original signal,</li>
<li>the extracted trend,</li>
<li>the extracted seasonal component,</li>
<li>the residual magnitude.</li>
</ul>
<h2 id="script">Script</h2>
<p>POSIX shell:</p>
<pre><code class="language-bash">PYTHONPATH=src python examples/visual_univariate_walkthrough.py \
--out-dir out/visual_univariate
</code></pre>
<p>PowerShell:</p>
<pre><code class="language-powershell">$env:PYTHONPATH='src'
python examples/visual_univariate_walkthrough.py --out-dir out/visual_univariate
</code></pre>
<p>This script uses <code>SSA</code> on a synthetic seasonal series with drift and a short
localized pulse.</p>
<p>Published raw stdout:</p>
<ul>
<li><a href="../../assets/generated/tutorials/visual-univariate/run_stdout.txt">run_stdout.txt</a></li>
</ul>
<h2 id="output-files">Output files</h2>
<p>The script writes:</p>
<ul>
<li><code>out/visual_univariate/ssa_components.png</code></li>
<li><code>out/visual_univariate/ssa_residual_error.png</code></li>
<li><code>out/visual_univariate/ssa_summary.csv</code></li>
<li><code>out/visual_univariate/ssa_summary.json</code></li>
</ul>
<p>Published experiment record:</p>
<ul>
<li><a href="../../assets/generated/tutorials/visual-univariate/ssa_summary.csv">ssa_summary.csv</a></li>
<li><a href="../../assets/generated/tutorials/visual-univariate/ssa_summary.json">ssa_summary.json</a></li>
</ul>
<p>Published summary from the current docs build:</p>
<table>
<thead>
<tr>
<th>Method</th>
<th>Backend</th>
<th style="text-align: right;">Length</th>
<th style="text-align: right;">Window</th>
<th style="text-align: right;">Rank</th>
<th style="text-align: right;">Residual RMS</th>
<th style="text-align: right;">Peak residual</th>
<th style="text-align: right;">Reconstruction error</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>SSA</code></td>
<td><code>native</code></td>
<td style="text-align: right;">180</td>
<td style="text-align: right;">36</td>
<td style="text-align: right;">8</td>
<td style="text-align: right;">0.1763</td>
<td style="text-align: right;">0.4020</td>
<td style="text-align: right;">0.0000</td>
</tr>
</tbody>
</table>
<p>Published example outputs:</p>
<p><img alt="SSA components" src="../../assets/generated/tutorials/visual-univariate/ssa_components.png" /></p>
<p><img alt="SSA residual magnitude" src="../../assets/generated/tutorials/visual-univariate/ssa_residual_error.png" /></p>
<h2 id="what-to-look-for">What to look for</h2>
<p>These figures and summary values come from a real local run of the tutorial
script on the current repository state.</p>
<p>In <code>ssa_components.png</code>:</p>
<ul>
<li>the trend should capture the slow upward drift,</li>
<li>the seasonal panel should preserve the repeating 12-step oscillation,</li>
<li>the residual should mostly absorb the short pulse and small mismatches.</li>
</ul>
<p>In <code>ssa_residual_error.png</code>:</p>
<ul>
<li>spikes indicate time regions where the decomposition is least comfortable,</li>
<li>broad high residual regions often suggest a wrong window, wrong rank, or
abrupt structure not well captured by the chosen method.</li>
</ul>
<h2 id="how-to-turn-this-into-an-experiment">How to turn this into an experiment</h2>
<p>Change only one parameter at a time:</p>
<ul>
<li>increase <code>window</code> to make the trend smoother,</li>
<li>reduce <code>rank</code> to force a more compressed representation,</li>
<li>compare the figure before and after each change instead of only watching one
scalar metric.</li>
</ul>
<p>This is usually the fastest way to build intuition for <code>SSA</code>.</p></div>
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