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Is the bounty system effective? - Meta Stack Exchange
https://math.meta.stackexchange.com/questions/20155/how-effective-are-bounties
could do some kinda econometric analysis using the data explorer to determine this once and for all: https://pinboard.in/u:nhaliday/b:c0cd449b9e69
maybe some kinda RDD in time, or difference-in-differences?
I don't think answer quality/quantity by time meets the common trend assumption for DD, tho... Questions that eventually receive bounty are prob higher quality in the first place, and higher quality answers accumulate more and better answers regardless. Hmm.
q-n-a  stackex  forum  community  info-foraging  efficiency  cost-benefit  data  analysis  incentives  attention  quality  ubiquity  supply-demand  multi  math  causation  endogenous-exogenous  intervention  branches  control  tactics  sleuthin  hmm  idk  todo  data-science  overflow  dbs  regression  shift  methodology  econometrics 
19 days ago by nhaliday
"Performance Matters" by Emery Berger - YouTube
Stabilizer is a tool that enables statistically sound performance evaluation, making it possible to understand the impact of optimizations and conclude things like the fact that the -O2 and -O3 optimization levels are indistinguishable from noise (sadly true).

Since compiler optimizations have run out of steam, we need better profiling support, especially for modern concurrent, multi-threaded applications. Coz is a new "causal profiler" that lets programmers optimize for throughput or latency, and which pinpoints and accurately predicts the impact of optimizations.

- randomize extraneous factors like code layout and stack size to avoid spurious speedups
- simulate speedup of component of concurrent system (to assess effect of optimization before attempting) by slowing down the complement (all but that component)
- latency vs. throughput, Little's law
video  presentation  programming  engineering  nitty-gritty  performance  devtools  compilers  latency-throughput  concurrency  legacy  causation  wire-guided  let-me-see  manifolds  pro-rata  tricks  endogenous-exogenous  control  random  signal-noise  comparison  marginal  llvm  systems  hashing  computer-memory  build-packaging  composition-decomposition  coupling-cohesion  local-global  dbs  direct-indirect  symmetry  research  models  metal-to-virtual  linux  measurement  simulation  magnitude  realness  hypothesis-testing  techtariat 
8 weeks ago by nhaliday
The Effect of High-Tech Clusters on the Productivity of Top Inventors
I use longitudinal data on top inventors based on the universe of US patents 1971 - 2007 to quantify the productivity advantages of Silicon-Valley style clusters and their implications for the overall production of patents in the US. I relate the number of patents produced by an inventor in a year to the size of the local cluster, defined as a city × research field × year. I first study the experience of Rochester NY, whose high-tech cluster declined due to the demise of its main employer, Kodak. Due to the growth of digital photography, Kodak employment collapsed after 1996, resulting in a 49.2% decline in the size of the Rochester high-tech cluster. I test whether the change in cluster size affected the productivity of inventors outside Kodak and the photography sector. I find that between 1996 and 2007 the productivity of non-Kodak inventors in Rochester declined by 20.6% relative to inventors in other cities, conditional on inventor fixed effects. In the second part of the paper, I turn to estimates based on all the data in the sample. I find that when an inventor moves to a larger cluster she experiences significant increases in the number of patents produced and the number of citations received.

...

In a counterfactual scenario where the quality of U.S. inventors is held constant but their geographical location is changed so that all cities have the same number of inventors in each field, inventor productivity would increase in small clusters and decline in large clusters. On net, the overall number of patents produced in the US in a year would be 11.07% smaller.

[ed.: I wonder whether the benefits of less concentration (eg, lower cost of living propping up demographics) are actually smaller than the downsides overall.]
study  economics  growth-econ  innovation  roots  branches  sv  tech  econ-productivity  density  urban-rural  winner-take-all  polarization  top-n  pro-rata  distribution  usa  longitudinal  intellectual-property  northeast  natural-experiment  population  endogenous-exogenous  intervention  counterfactual  cost-benefit 
10 weeks ago by nhaliday
The returns to speaking a second language
Does speaking a foreign language have an impact on earnings? The authors use a variety of empirical strategies to address this issue for a representative sample of U.S. college graduates. OLS regressions with a complete set of controls to minimize concerns about omitted variable biases, propensity score methods, and panel data techniques all lead to similar conclusions. The hourly earnings of those who speak a foreign language are more than 2 percent higher than the earnings of those who do not. The authors obtain higher and more imprecise point estimates using state high school graduation and college entry and graduation requirements as instrumental variables.

...

We find that college graduates who speak a second language earn, on average, wages that are 2 percent higher than those who don’t. We include a complete set of controls for general ability using information on grades and college admission tests and reduce the concern that selection drives the results controlling for the academic major chosen by the student. We obtain similar results with simple regression methods if we use nonparametric methods based on the propensity score and if we exploit the temporal variation in the knowledge of a second language. The estimates, thus, are not driven by observable differences in the composition of the pools of bilinguals and monolinguals, by the linear functional form that we impose in OLS regressions, or by constant unobserved heterogeneity. To reduce the concern that omitted variables bias our estimates, we make use of several instrumental variables (IVs). Using high school and college graduation requirements as instruments, we estimate more substantial returns to learning a second language, on the order of 14 to 30 percent. These results have high standard errors, but they suggest that OLS estimates may actually be biased downward.

...

In separate (unreported) regressions, we explore the labor market returns to speaking specific languages. We estimate OLS regressions following the previous specifications but allow the coefficient to vary by language spoken. In our sample, German is the language that obtains the highest rewards in the labor market. The returns to speaking German are 3.8 percent, while they are 2.3 for speaking French and 1.5 for speaking Spanish. In fact, only the returns to speaking German remain statistically significant in this regression. The results indicate that those who speak languages known by a smaller number of people obtain higher rewards in the labor market.14

The Relative Importance of the European Languages: https://ideas.repec.org/p/kud/kuiedp/0623.html
study  economics  labor  cost-benefit  hmm  language  foreign-lang  usa  empirical  evidence-based  education  human-capital  compensation  correlation  endogenous-exogenous  natural-experiment  policy  wonkish  🎩  french  germanic  latin-america  multi  spanish  china  asia  japan 
july 2019 by nhaliday
Randomizing Religion: The Impact of Protestant Evangelism on Economic Outcomes
To test the causal impact of religiosity, we conducted a randomized evaluation of an evangelical Protestant Christian values and theology education program that consisted of 15 weekly half-hour sessions. We analyze outcomes for 6,276 ultra-poor Filipino households six months after the program ended. We find _significant increases in religiosity and income_, no significant changes in total labor supply, assets, consumption, food security, or _life satisfaction, and a significant decrease in perceived relative economic status_. Exploratory analysis suggests the program may have improved hygienic practices and increased household discord, and that _the income treatment effect may operate through increasing grit_.

https://marginalrevolution.com/marginalrevolution/2018/02/randomizing-religion-impact-protestant-evangelism-economic-outcomes.html

Social Cohesion, Religious Beliefs, and the Effect of Protestantism on Suicide: https://www.mitpressjournals.org/doi/abs/10.1162/REST_a_00708
In an economic theory of suicide, we model social cohesion of the religious community and religious beliefs about afterlife as two mechanisms by which Protestantism increases suicide propensity. We build a unique micro-regional dataset of 452 Prussian counties in 1816-21 and 1869-71, when religiousness was still pervasive. Exploiting the concentric dispersion of Protestantism around Wittenberg, our instrumental-variable model finds that Protestantism had a substantial positive effect on suicide. Results are corroborated in first-difference models. Tests relating to the two mechanisms based on historical church-attendance data and modern suicide data suggest that the sociological channel plays the more important role.

this is also mentioned in the survey of reformation effects (under "dark" effects)
study  field-study  sociology  wonkish  intervention  religion  theos  branches  evidence-based  christianity  protestant-catholic  asia  developing-world  economics  compensation  money  labor  human-capital  emotion  s-factor  discipline  multi  social-structure  death  individualism-collectivism  n-factor  cohesion  causation  endogenous-exogenous  history  early-modern  europe  germanic  geography  within-group  urban-rural  marginal-rev  econotariat  commentary  class  personality  social-psych 
february 2018 by nhaliday
Effects of Education on Political Opinions: An International Study | International Journal of Public Opinion Research | Oxford Academic
Education and Political Party: The Effects of College or Social Class?: https://www.jstor.org/stable/2778029
The impact of education on political ideology: Evidence from European compulsory education reforms: https://www.sciencedirect.com/science/article/pii/S0272775716301704
correlation is with leftism, causal effect is shift to right

Greg thinks there are some effects: https://pinboard.in/u:nhaliday/b:5adca8f16265

https://twitter.com/GarettJones/status/964209775419457536
https://archive.is/oFELz
https://archive.is/f1DBF
https://archive.is/5iiqn

http://econlog.econlib.org/archives/2008/12/education_ideol.html

https://twitter.com/pseudoerasmus/status/963451867912130561
https://archive.is/sHI7g
https://archive.is/B5Gdv
https://archive.is/hFERC
https://archive.is/8IUDm
Bryan Caplan has written a very persuasive book suggesting that retention/transfer of learning is very low. how do we know it’s not the same with the “PoMo ethos”
study  polisci  sociology  education  higher-ed  intervention  branches  politics  ideology  world  general-survey  correlation  causation  left-wing  right-wing  phalanges  multi  coalitions  history  mostly-modern  usa  cold-war  europe  EU  natural-experiment  endogenous-exogenous  direction  west-hunter  scitariat  twitter  social  discussion  backup  econotariat  garett-jones  cracker-econ  data  analysis  regression  org:econlib  biodet  behavioral-gen  variance-components  environmental-effects  counter-revolution  strategy  tactics  pseudoE  demographics  race  gender  markets  impetus  roots  explanans  migration  social-norms  persuasion 
february 2018 by nhaliday
Education and Political Participation: Exploring the Causal Link | SpringerLink
To test for a causal effect of education, we exploit the rise in education levels among males induced by the Vietnam draft. We find little reliable evidence that education induced by the draft significantly increases participation rates.
study  politics  polisci  education  human-capital  correlation  confounding  endogenous-exogenous  natural-experiment  null-result  military  war  history  mostly-modern  cold-war  asia  developing-world  sociology  phalanges  stylized-facts 
december 2017 by nhaliday
The Long-run Effects of Agricultural Productivity on Conflict, 1400-1900∗
This paper provides evidence of the long-run effects of a permanent increase in agricultural productivity on conflict. We construct a newly digitized and geo-referenced dataset of battles in Europe, the Near East and North Africa covering the period between 1400 and 1900 CE. For variation in permanent improvements in agricultural productivity, we exploit the introduction of potatoes from the Americas to the Old World after the Columbian Exchange. We find that the introduction of potatoes permanently reduced conflict for roughly two centuries. The results are driven by a reduction in civil conflicts

http://marginalrevolution.com/marginalrevolution/2017/12/monday-assorted-links-135.html#comment-159746885
#4 An obvious counterfactual is of course the potato blight (1844 and beyond) in Europe. Here’s the Wikipedia page ‘revolutions of 1848’ https://en.wikipedia.org/wiki/Revolutions_of_1848
pdf  study  marginal-rev  economics  broad-econ  cliometrics  history  medieval  early-modern  age-of-discovery  branches  innovation  discovery  agriculture  food  econ-productivity  efficiency  natural-experiment  europe  the-great-west-whale  MENA  war  revolution  peace-violence  trivia  cocktail  stylized-facts  usa  endogenous-exogenous  control  geography  cost-benefit  multi  econotariat  links  poast  wiki  reference  events  roots 
december 2017 by nhaliday
The Power of Abortion Policy - Marginal REVOLUTION
I provide new evidence on the relative “powers” of contraception and abortion policy in effecting the dramatic social transformations of the 1960s and 1970s. Trends in sexual behavior suggest that young women’s increased access to the birth control pill fueled the sexual revolution, but neither these trends nor difference-in-difference estimates support the view that this also led to substantial changes in family formation. Rather, the estimates robustly suggest that it was liberalized access to abortion that allowed large numbers of women to delay marriage and motherhood.
econotariat  marginal-rev  commentary  study  summary  economics  policy  intervention  sociology  gender  sex  fertility  demographics  demographic-transition  history  mostly-modern  cold-war  rot  roots  explanans  technology  microfoundations  nitty-gritty  sexuality  modernity  the-bones  general-survey  endogenous-exogenous  control  life-history  social-norms  medicine  abortion-contraception-embryo  nascent-state 
december 2017 by nhaliday
Land, history or modernization? Explaining ethnic fractionalization: Ethnic and Racial Studies: Vol 38, No 2
Ethnic fractionalization (EF) is frequently used as an explanatory tool in models of economic development, civil war and public goods provision. However, if EF is endogenous to political and economic change, its utility for further research diminishes. This turns out not to be the case. This paper provides the first comprehensive model of EF as a dependent variable.
study  polisci  sociology  political-econ  economics  broad-econ  diversity  putnam-like  race  concept  conceptual-vocab  definition  realness  eric-kaufmann  roots  database  dataset  robust  endogenous-exogenous  causation  anthropology  cultural-dynamics  tribalism  methodology  world  developing-world  🎩  things  metrics  intricacy  microfoundations 
december 2017 by nhaliday
ON THE ORIGIN OF STATES: STATIONARY BANDITS AND TAXATION IN EASTERN CONGO
As a foundation for this study, I organized the collection of village-level panel data on violent actors, managing teams of surveyors, village elders, and households in 380 war-torn areas of DRC. I introduce optimal taxation theory to the decision of violent actors to establish local monopolies of violence. The value of such decision hinges on their ability to tax the local population. A sharp rise in the global demand for coltan, a bulky commodity used in the electronics industry, leads violent actors to impose monopolies of violence and taxation in coltan sites, which persist even years after demand collapses. A similar rise in the demand for gold, easier to conceal and more difficult to tax, does not. However, the groups who nevertheless control gold sites are more likely to respond by undertaking investments in fiscal capacity, consistent with the difficulty to observe gold, and with well-documented trajectories of state formation in Europe (Ardant, 1975). The findings support the view that the expected revenue from taxation, determined in particular by tax base elasticity and costly investments in fiscal capacity, can explain the stages of state formation preceding the states as we recognize them today.
pdf  study  economics  growth-econ  broad-econ  political-econ  polisci  leviathan  north-weingast-like  unintended-consequences  institutions  microfoundations  econometrics  empirical  government  taxes  rent-seeking  supply-demand  incentives  property-rights  africa  developing-world  peace-violence  interests  longitudinal  natural-experiment  endogenous-exogenous  archaeology  trade  world  feudal  roots  ideas  cost-benefit  econ-productivity  traces 
november 2017 by nhaliday
Alcohol consumption and lifetime change in cognitive ability: a gene × environment interaction study | SpringerLink
We found a significant gene × alcohol consumption interaction on lifetime cognitive change (p = 0.007). Individuals with higher genetic ability to process alcohol showed relative improvements in cognitive ability with more consumption, whereas those with low processing capacity showed a negative relationship between cognitive change and alcohol consumption with more consumption.
study  psychology  cog-psych  psychometrics  iq  metabolic  ethanol  mendel-randomization  endo-exo  GxE  homo-hetero  biodet  behavioral-gen  environmental-effects  endogenous-exogenous 
october 2017 by nhaliday

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