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MAC/FAC: A Model of Similarity-Based Retrieval - Forbus - 1995 - Cognitive Science - Wiley Online Library
We present a model of similarity-based retrieval that attempts to capture three seemingly contradictory psychological phenomena: (a) structural commonalities are weighed more heavily than surface commonalities in similarity judgments for items in working memory; (b) in retrieval, superficial similarity is more important than structural similarity; and yet (c) purely structural (analogical) remindings e sometimes experienced. Our model, MAC/FAC, explains these phenomena in terms of a two-stage process. The first stage uses a computationally cheap, non-structural matcher to filter candidate long-term memory items. It uses content vectors, a redundant encoding of structured representations whose dot product estimates how well the corresponding structural representations will match. The second stage uses SME (structure-mapping engine) to compute structural matches on the handful of items found by the first stage. We show the utility of the MAC/FAC model through a series of computational experiments: (a) We demonstrate that MAC/FAC can model patterns of access found in psychological data; (b) we argue via sensitivity analyses that these simulation results rely on the theory; and (c) we compare the performance of MAC/FAC with ARCS, an alternate model of similarity-based retrieval, and demonstrate that MAC/FAC explains the data better than ARCS. Finally, we discuss limitations and possible extensions of the model, relationships with other recent retrieval models, and place MAC/FAC in the context of other recent work on the nature of similarity.
24 days ago by tonyyet
If Quantum Computers are not Possible Why are Classical Computers Possible? | Combinatorics and more
As most of my readers know, I regard quantum computing as unrealistic. You can read more about it in my Notices AMS paper and its extended version (see also this post) and in the discussion of Puzzle 4 from my recent puzzles paper (see also this post). The amazing progress and huge investment in quantum computing (that I presented and update  routinely in this post) will put my analysis to test in the next few years.
tcstariat  mathtariat  org:bleg  nibble  tcs  cs  computation  quantum  volo-avolo  no-go  contrarianism  frontier  links  quantum-info  analogy  comparison  synthesis  hi-order-bits  speedometer  questions  signal-noise 
5 weeks ago by nhaliday
Americans Used to be Proud of their Universities | The American Conservative
Some Notes on the Finances of Top Chinese Universities:
A glimpse into the finances of top Chinese universities suggests they share more than we might have imagined with American flagship public universities, but also that claims of imminent “catch up” might be overblown
news  org:mag  right-wing  reflection  history  early-modern  pre-ww2  mostly-modern  europe  germanic  britain  gibbon  trends  rot  zeitgeist  usa  china  asia  sinosphere  higher-ed  academia  westminster  comparison  analogy  multi  org:edu  money  monetary-fiscal  data  analysis  pro-rata  cs  tech  realness  social-science  the-world-is-just-atoms  science  innovation  is-ought  truth  identity-politics 
10 weeks ago by nhaliday
Can Europe Run Greece? Lessons from U.S. Fiscal Receiverships in Latin America, 1904-31 by Noel Maurer, Leticia Arroyo Abad :: SSRN
In 2012 and again in 2015, the German government proposed sending German administrators to manage Greece’s tax and privatization authorities. The idea was that shared governance would reduce corruption and root out inefficient practices. (In 2017 the Boston Globe proposed a similar arrangement for Haiti.) We test a version of shared governance using eight U.S. interventions between 1904 and 1931, under which American officials took over management of Latin American fiscal institutions. We develop a stylized model in which better monitoring by incorruptible managers does not lead to higher government revenues. Using a new panel of data on fiscal revenues and the volume and terms of trade, we find that revenue fell under receiverships. Our results hold under instrumental variables estimation and with counterfactual specifications using synthetic controls.
study  economics  broad-econ  political-econ  growth-econ  polisci  government  monetary-fiscal  money  europe  the-great-west-whale  germanic  mediterranean  usa  latin-america  conquest-empire  corruption  integrity  n-factor  management  history  mostly-modern  pre-ww2  models  analogy  track-record  endo-exo  counterfactual  cliometrics  micro  endogenous-exogenous 
11 weeks ago by nhaliday

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