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2. Singular spectrum analysis - Wikipedia

   en.wikipedia.org/wiki/Singular_spectrum_analysis

   The origins of SSA and, more generally, of subspace-based methods for signal processing, go back to the eighteenth century (Prony's method).A key development was the formulation of the spectral decomposition of the covariance operator of stochastic processes by Kari Karhunen and Michel Loève in the late 1940s (Loève, 1945; Karhunen, 1947).

3. Social Security: How To Fill Out an Application for ... - AOL

   www.aol.com/finance/social-security-fill...

   Before getting started, the SSA recommends you review the eligibility guidelines, located here, and also take a look at the checklist, located here, for the materials you will need to complete the ...