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Sökning: L773:0162 1459 OR L773:1537 274X

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  • Dias, Monica Costa, et al. (författare)
  • Treatment Evaluation With Selective Participation and Ineligibles
  • 2013
  • Ingår i: Journal of the American Statistical Association. - : Informa UK Limited. - 0162-1459 .- 1537-274X. ; 108:502, s. 441-455
  • Tidskriftsartikel (refereegranskat)abstract
    • Matching methods for treatment evaluation based on a conditional independence assumption do not balance selective unobserved differences between treated and nontreated. We derive a simple correction term if there is an instrument that shifts the treatment probability to zero in specific cases. Policies with eligibility restrictions, where treatment is impossible if some variable exceeds a certain value, provide a natural application. In an empirical analysis, we exploit the age eligibility restriction in the Swedish Youth Practice subsidized work program for young unemployed, where compliance is imperfect among the young. Adjusting the matching estimator for selectivity changes the results toward making subsidized work detrimental in moving individuals into employment.
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  • Ekström, Magnus, 1966-, et al. (författare)
  • Subsampling methods to estimate the variance of sample means based on nonstationary spatial data with varying expected values
  • 2004
  • Ingår i: Journal of the American Statistical Association. - : Informa UK Limited. - 0162-1459 .- 1537-274X. ; 99:465, s. 82-95
  • Tidskriftsartikel (refereegranskat)abstract
    • Subsampling and block resampling methods have been suggested in the literature to nonparametrically estimate the variance of statistics computed from spatial data. Usually stationary data are required. However, in empirical applications, the assumption of stationarity often must be rejected. This article proposes nonparametric methods to estimate the variance of (functions of) sample means based on nonstationary spatial data using subsampling. We assume that data are observed on a lattice in some region of R-2. In the data that we consider, the information in the different picture elements (pixels) of the lattice are allowed to come from different distributions, with smoothly varying expected values, or with expected values decomposed additively into directional components. Furthermore, pixels are assumed to be locally dependent, and the dependence structure is allowed to differ over the lattice. Consistent variance estimators for (functions of) sample means, together with convergence rates in mean square, are provided under these assumptions. An example with applications to forestry, using satellite data, is discussed.
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  • Frölich, Markus, et al. (författare)
  • Exploiting Regional Treatment Intensity for the Evaluation of Labor Market Policies
  • 2010
  • Ingår i: Journal of the American Statistical Association. - : Informa UK Limited. - 0162-1459 .- 1537-274X. ; 105:491, s. 1014-1029
  • Tidskriftsartikel (refereegranskat)abstract
    • We estimate the effects of active labor market policies (ALMPs) on subsequent employment and earnings by nonparametric instrumental variable estimators. Very informative administrative Swiss data with detailed regional information are combined with exogenous regional variation in program participation probabilities to generate an instrument within well-defined local labor markets. We find that implementation of an ALMP increased individual employment probabilities by about 15% for unemployed that might be considered "marginal" participants.
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