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description= 15 posts published by Lars Syll during September 2023;
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comments off on better than diff in diff share on facebook opens in new window facebook share on x opens in new window x share on bluesky opens in new window bluesky jazz på svenska 23 sep 2023 at 17 42 posted in varia comments off on jazz på svenska anders och jens johansson är söner till legendaren jan johansson för några år sedan bestämde sig bröderna för att ge sig ut på turné där de tolkar jans låtar från jazz på svenska i torsdags kom de till malmö och gav en oförglömlig konsert på palladium share on facebook opens in new window facebook share on x opens in new window x share on bluesky opens in new window bluesky how to avoid pernicious fictional statistics 21 sep 2023 at 11 03 posted in statistics econometrics comments off on how to avoid pernicious fictional statistics mathematics is a limited component of solutions to real world problems as it expresses only what is expected to be true if all our assumptions are correct including implicit assumptions that are omnipresent and often incorrect statistical methods are rife with implicit assumptions whose violation can be life threatening when results from them are used to set policy among them are that there is human equipoise or unbiasedness in data generation management analysis and reporting these assumptions correspond to levels of cooperation competence neutrality and integrity that are absent more often than we would like to believe given this harsh reality we should ask what meaning if any we can assign to the p values statistical significance declarations confidence intervals and posterior probabilities that are used to decide what and how to present or spin discussions of analyzed data by themselves p values and ci do not test any hypothesis nor do they measure the significance of results or the confidence we should have in them the sense otherwise is an ongoing cultural error perpetuated by large segments of the statistical and research community via misleading terminology so called inferential statistics can only become contextually interpretable when derived explicitly from causal stories about the real data generator such as randomization and can only become reliable when those stories are based on valid and public documentation of the physical mechanisms that generated the data absent these assurances traditional interpretations of statistical results become pernicious fictions that need to be replaced by far more circumspect descriptions of data and model relations sander greenland all science entails human judgment and using statistical models does not relieve us of that necessity working with misspecified models the scientific value of significance testing is actually zero even though you re making valid statistical inferences statistical models and concomitant significance tests are no substitutes for doing real science in its standard form a significance test is not the kind of severe test that we are looking for in our search for being able to confirm or disconfirm empirical scientific hypotheses this is problematic for many reasons one being that there is a strong tendency to accept the null hypothesis since it can t be rejected at the standard 5 significance level and as shown over and over again when it is applied people have a tendency to read not disconfirmed as probably confirmed the excessive reliance on significance testing in science is disturbing and should be fought but it is also important to put significance testing abuse in perspective the real problem in today s social sciences is not significance testing per se no the real problem has to do with the often unqualified and mechanistic application of statistical methods to real world phenomena without having even the slightest idea of how the assumptions behind the statistical models condition and severely limit the value of the inferences made share on facebook opens in new window facebook share on x opens in new window x share on bluesky opens in new window bluesky econometrics a mixture of metaphors metaphysics and a pinch of bluff 19 sep 2023 at 16 17 posted in statistics econometrics comments off on econometrics a mixture of metaphors metaphysics and a pinch of bluff this effort to create foundations for the probability approach in econometrics finally results in an inconsistent set of claims in its defence first there are vast amounts of experience which warrant a frequency interpretation this is supported by repetitive discussions of experimental design but the inability to experiment inspires an epistemological interpretation then haavelmo mentions the futility of bothering with these issues because the probability approach is most of all a useful tool this would be an instrumentalistic justification for its use if haavelmo gave supportive evidence for his claim there is not one example which attempts to do so in practice econometricians mostly have to do without experiments from the early days on they tried to provide stand ins for real experimentation first it was argued that economic models themselves could substitute as alternatives to experiments however this was not intended so much as to justify probabilistic inference but as primarily to level economics with the experimental sciences then haavelmo introduced his version of experimental design in order to make economic theories statistically operational again this could not provide the justification for using the probabilistic framework the founders of econometrics tried to adapt the sampling approach to a non experimental small sample domain they tried to justify this with a priori and analytical arguments however the ultimate argument for a probability approach in econometrics consists of a mixture of metaphors metaphysics and a pinch of bluff as always if people do not give justifications for the validity of the assumptions they make well then those assumptions are nothing but assumptions just talking about as did haavelmo experimental design hoping that nature takes care of the necessary ceteris paribus conditions and believing it fruitful to treat economic data as if they were a set of truly random data does not take us very far treating observational data as if they were experimental is nothing but wishful thinking based on a totally unwarranted assumption bridging from econometric and statistical models to real world target systems demands much more most of all you have to not just rhetorically search for the real data generating mechanisms the assumptions of imaginary super populations or hypothetical infinite populations are some of the many dubious assumptions used in modern econometrics as social scientists and economists we have to confront the all important question of how to handle uncertainty and randomness should we define randomness with probability if we do we have to accept that to speak of randomness we also have to presuppose the existence of nomological probability machines since probabilities cannot be spoken of and actually to be strict do not at all exist without specifying such system contexts accepting a domain of probability theory and sample space of infinite populations also implies that judgments are made on the basis of observations that are actually never made infinitely repeated trials or samplings never take place in the real world so that cannot be a sound inductive basis for a science with aspirations of explaining real world socio economic processes structures or events it s not tenable and as if this wasn t enough one could as argued also seriously wonder what kind of populations these statistical and econometric models ultimately are based on why should we as social scientists and not as pure mathematicians working with formal axiomatic systems without the urge to confront our models with real target systems unquestioningly accept models based on concepts like the infinite superpopulations used in e g the potential outcome framework that has become so popular lately in social sciences of course one could treat observational or experimental data as random samples from real populations i have no problem with that at least not as long as one remembers that usually the random sampling assumptions do not apply to the kind of convenience samples that economic data standardly constitute and that the usual statistical inferences therefore can not be made however probabilistic econometrics does not content itself with that kind of population instead it creates imaginary populations of parallel universes and assumes that our data are random samples from that kind of infinite superpopulations but this is actually nothing else but hand waving and it is inadequate for real science in social sciences including economics it s always wise to ponder c s peirce s remark that universes are not as common as peanuts nowadays it has almost become a self evident truism among economists that you cannot expect people to take your arguments seriously unless they are based on or backed up by advanced econometric modelling so legions of mathematical statistical theorems are proved and heaps of fiction are being produced masquerading as science the rigour of the econometric modelling and the far reaching assumptions they are built on are frequently not supported by data modelling assumptions made in statistics and econometrics are more often than not made for mathematical tractability reasons rather than verisimilitude that is unfortunately also a reason why the methodological rigour encountered when taking part in statistical and econometric research to a large degree is nothing but a deceptive appearance the models constructed may seem technically advanced and very sophisticated but that s usually only because the problems here discussed have been swept under the carpet assuming that our data are generated by coin flips in an imaginary superpopulation only means that we get answers to questions that we are not asking share on facebook opens in new window facebook share on x opens in new window x share on bluesky opens in new window bluesky bankerna driver på klimatkrisen 19 sep 2023 at 13 07 posted in economics comments off on bankerna driver på klimatkrisen offentliga institutioner reglerar redan i dag bankernas penningskapande i allmänhetens intresse om än på ett mycket fragmentariskt sätt det tydligaste exemplet är kanske de strikta skyldigheter som bankerna har för att säkerställa att de pengar de skapar inte används för finansiering av terrorism och penningtvätt tidigare efter andra världskriget styrdes många banker att låna ut till sektorer som ansågs viktiga för den nationella utvecklingen ett annat alternativ vore att staten drar tillbaka bankernas privilegium att skapa pengar och tvingar dem att helt finansiera sin utlåning på egen hand genom att låna in pengar på marknaden i stället för att vår officiella valuta ska skapas automatiskt till vad helst bankerna finner lönsamt som ligger inom lagens ramar så innebär detta alternativ att centralbanken delar ut nyskapade pengar som e kronor eller kontanter exempelvis direkt till medborgarna eller till staten medborgarna eller staten kan då välja hur nya pengar ska användas och aktivt prioritera socialt ekonomiskt och ekologiskt önskvärda och hållbara projekt ska vi klara klimatkrisen så behövs en rejäl offentlig debatt om makten att skapa pengar vi måste erkänna att bankernas pengaskapande har avgörande betydelse för allas vår framtid och att staten som auktoriserat bankerna med denna makt har ett moraliskt ansvar att se till att penningsystemet organiseras för planetens och allmänhetens bästa steve keen lars syll samuel färdow katzen et al share on facebook opens in new window facebook share on x opens in new window x share on bluesky opens in new window bluesky radical universalism beyond identity 19 sep 2023 at 09 25 posted in politics society comments off on radical universalism beyond identity the universalist ideas of the enlightenment are still relevant despite the numerous criticisms that have been levelled against them the enlightenment was characterized by a spirit of exploration that led to new discoveries in both science and culture rather than promoting a narrow worldview it encouraged people to question assumptions and religious beliefs it still provides a framework for addressing some of the most pressing problems facing society such as climate change and social inequality enlightenment is man s emergence from his self imposed nonage nonage is the inability to use one s own understanding without another s guidance this nonage is self imposed if its cause lies not in lack of understanding but in indecision and lack of courage to use one s own mind without another s guidance sapere aude have the courage to use your own understanding is therefore the motto of the enlightenment enlightenment requires nothing but freedom and the most innocent of all that may be called freedom freedom to make public use of one s reason in all matters we find restrictions on freedom everywhere but which restriction is harmful to enlightenment which restriction is innocent and which advances enlightenment i reply the public use of one s reason must be free at all times and this alone can bring enlightenment to mankind immanuel kant share on facebook opens in new window facebook share on x opens in new window x share on bluesky opens in new window bluesky min vän den sorts människa som gud inte gjorde någon kopia av 18 sep 2023 at 13 02 posted in varia comments off on min vän den sorts människa som gud inte gjorde någon kopia av år 2018 var precis som de flesta år ett år med både glädje och sorg för mig kommer året ändå alltid att främst förknipppas med att det var året då min bäste vän sedan mer än trettio år bengt nilsson gick ur tiden inga ord kan riktigt beskriva vad man känner när en människa man älskat inte längre finns där man minns skratten glädjen omtanken den mäktiga intelligensen den drastiska humorn och det starka sociala patoset i dag är det fem år sedan du gick bort min vän livet går vidare men kommer alltid att vara lite gråare lite tristare utan dig även om det ofta känns som du brukade säga förtvivlat hjälper mig minnet av vår vänskap finna modet att leva vidare du var en vän av den sort som gud inte gjorde någon kopia av och som glömskan aldrig kommer att rå på share on facebook opens in new window facebook share on x opens in new window x share on bluesky opens in new window bluesky resisting the statistical significance testing temptation 18 sep 2023 at 10 22 posted in statistics econometrics 3 comments imagine a dictator game in which a mixed sex group of experimental subjects are used as first players who can decide which share of their initial endowment they give to a second player one person acts as second player for the whole group additionally assume that the experimental subjects are a convenience sample but not a random sample of a well defined broader population what kind of statistical inferences are possible neither one o...
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