updated materials

Author: idamariesl

lessons/lesson_06.html

@@ -87,6 +87,7 @@ <h2>Program Schedule</h2>
 
     <h2>Materials</h2>
     <ul>
+        <li><a href="https://github.com/centre-for-humanities-computing/quantitative-methods/blob/main/files/03122025_unsupervised.pdf">Slides</a></li>
         <li><a href="https://doi.org/10.1146/annurev-polisci-053119-015921">Machine Learning for Social Science: An Agnostic Approach</a></li>
         <li><a href="https://doi.org/10.1016/j.ipm.2024.103665">AI for social science and social science of AI: A survey</a></li>
         <li><a href="/quantitative-methods/files/2024_quant_text.pdf">Quantitative Text Analysis (revisit Lesson 1)</a></li>