The paper clarifies the relationship among several information matrices for the maximum likelihood estimates (MLEs) of item parameters. It shows that the process of calculating the observed information matrix also generates a related matrix that is the middle piece of a sandwich-type covariance...

We consider the estimation of the standard errors of individual-specific parameters calculated ex post from a non-linear random parameters model. Our key contribution lies in introducing a simple method of appropriately calculating these standard errors, which explicitly takes into account the...

This Selected Issues paper focuses on financing constraints and productivity in Estonia. The paper examines two questions: (1) is there evidence of financing constraints among Estonian firms; and (2) have financing constraints reduced firm-level total factor productivity (TFP)? These questions...

This Selected Issues Paper on Iran reviews that monetary factors are the main determinants of inflation in the country. Government spending out of oil revenues leads to large liquidity injections that the central bank accommodates owing to its efforts to prevent a significant nominal...

This paper presents the Republic of Armenia’s report on the Observance of Standards and Codes and detailed assessment using the data quality assessment framework. Armenia exceeds Special Data Dissemination Standard requirements for both periodicity and timeliness in releases of data on...

This Selected Issues paper analyzes the empirical relationship between corporate leverage—and other indicators of financial health—and investment in Israel, using dynamic panel data techniques. The results suggest that weak balance sheets may well have contributed to the investment...

Inequality indices for self-assessed health and life satisfaction are typically constructed as functions of the cumulative distribution function. We present a unified methodology for the estimation of the resulting inequality indices. We also obtain explicit standard error formulas in the...

This paper systematically compares methods to build confidence intervals for willingness to pay measures in a discrete choice context. It contributes to the literature by including methods developed in other research fields. Monte Carlo simulations are used to assess the performance of all the...

In the growth literature, evidence on income convergence is mixed. In the development literature, health and education indicators are also often used. This study examines whether health and education levels are converging across countries and calculates their convergence speed, using data from...