منابع مشابه
How Much Should We Trust
Most papers that employ Differences-in-Differences estimation (DD) use many years of data and focus on serially correlated outcomes but ignore that the resulting standard errors are inconsistent. To illustrate the severity of this issue, we randomly generate placebo laws in state-level data on female wages from the Current Population Survey. For each law, we use OLS to compute the DD estimate o...
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† This is an expanded version of a presentation given by Brian Williams at the 2nd International HIV Treatment as Prevention (TasP) Workshop, April 22−25, 2012, Vancouver, BC, Canada Abstract In most countries CD4+ cell counts are still used for deciding when to start HIV-positive people on anti-retroviral therapy. However, various CD4+ thresholds, 200, 350 or 500/μL, are chosen arbitrarily and...
متن کاملFeasibility of prehospital treatment with activated charcoal: Who could we treat, who should we treat?
OBJECTIVES To investigate the feasibility and potential risk benefit of prehospital administration of activated charcoal. METHODS Review of deliberate self poisoning presentations to the emergency department (ED) of a toxicology unit by ambulance over six years. Data were extracted from a standardised prospective database of poisonings. Outcomes included: number of patients attended by ambula...
متن کاملWho Should You Trust? Discriminating Genuine from Deceptive Eyewitness Accounts
In this study, we tested whether modified cognitive interviewing (MCI) is a valid method for distinguishing between genuine and deceptive human eyewitness accounts. 102 healthy military personnel were the participants of this study. 54 were assigned to a manual task condition and 48 to a cognitive task condition. Of the 54 assigned to the manual task, 17 truly performed the task and were truthf...
متن کاملHow Much Should We Trust Differences-in-differences Estimates?*
Most papers that employ Differences-in-Differences estimation (DD) use many years of data and focus on serially correlated outcomes but ignore that the resulting standard errors are inconsistent. To illustrate the severity of this issue, we randomly generate placebo laws in state-level data on female wages from the Current Population Survey. For each law, we use OLS to compute the DD estimate o...
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ژورنال
عنوان ژورنال: Human Reproduction
سال: 2017
ISSN: 0268-1161,1460-2350
DOI: 10.1093/humrep/dex211