[var_dmd, svd_intro, measurement_models] Correct math, add exercises

lectures/_static/quant-econ.bib

@@ -5356,3 +5356,52 @@ @article{ShakedSutton1982
   pages   = {3--13},
   year    = {1982}
 }
+
+@article{sargent2026dynamic,
+  title     = {Dynamic Mode Decompositions and Vector Autoregressions},
+  author    = {Sargent, Thomas J. and Selvakumar, Yatheesan J. and Yang, Ziyue},
+  journal   = {International Economic Review},
+  year      = {2026},
+  publisher = {Wiley Online Library}
+}
+
+@techreport{SSY_CEX_2026,
+  author      = {Sargent, Thomas J. and Selvakumar, Yatheesan J. and Yang, Ziyue},
+  title       = {Aggregate Shocks and Cross-Section Dynamics: Quantifying
+                 Redistribution and Insurance in {US} Household Data},
+  institution = {New York University},
+  year        = {2026}
+}
+
+@article{anderson1951,
+  author  = {Anderson, T. W.},
+  title   = {Estimating Linear Restrictions on Regression Coefficients for
+             Multivariate Normal Distributions},
+  journal = {Annals of Mathematical Statistics},
+  volume  = {22},
+  number  = {3},
+  pages   = {327--351},
+  year    = {1951}
+}
+
+@article{stock_watson2002,
+  author  = {Stock, James H. and Watson, Mark W.},
+  title   = {Forecasting Using Principal Components from a Large Number of
+             Predictors},
+  journal = {Journal of the American Statistical Association},
+  volume  = {97},
+  number  = {460},
+  pages   = {1167--1179},
+  year    = {2002}
+}
+
+@article{Geweke1982,
+  author  = {Geweke, John},
+  title   = {Measurement of Linear Dependence and Feedback Between Multiple
+             Time Series},
+  journal = {Journal of the American Statistical Association},
+  volume  = {77},
+  number  = {378},
+  pages   = {304--313},
+  year    = {1982}
+}