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Author: Katayama, Hajime

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1.	Acworth, Alex De Roos, Nicolas Katayama, Hajime
1.	Substance Use and Adolescent Sexual Activity Applied Economics 44,9 (2012): 1067-1079. Also: http://www.tandfonline.com/doi/abs/10.1080/00036846.2010.534074#preview Cohort(s): NLSY97 Publisher: Taylor & Francis Keyword(s): Contraception; Gender Differences; Heterogeneity; Propensity Scores; Sexual Behavior; Substance Use Using the National Longitudinal Survey of Youth 1997, we examine the relationship between initiating substance use and youth sexual behaviour. We employ a combination of panel data and propensity score matching techniques to control for observed and unobserved heterogeneity. The results indicate striking differences across gender. For males, initiating alcohol or marijuana use is positively and significantly associated with the likelihood of engaging in sexual intercourse and uncontracepted sexual intercourse. For females, in contrast, there is no robust evidence for such links.
	Bibliography Citation Acworth, Alex, Nicolas De Roos and Hajime Katayama. "Substance Use and Adolescent Sexual Activity." Applied Economics 44,9 (2012): 1067-1079.

2.	Johar, Meliyanni Katayama, Hajime
2.	Quantile Regression Analysis of Body Mass and Wages Health Economics 21,5 (May 2012): 597-611. Also: http://onlinelibrary.wiley.com/doi/10.1002/hec.1736/abstract Cohort(s): NLSY79 Publisher: Wiley Online Keyword(s): Body Mass Index (BMI); Endogeneity; Ethnic Differences; Gender Differences; Racial Differences; Social Capital; Wage Determination; Wage Differentials; Wages Permission to reprint the abstract has not been received from the publisher. Using the National Longitudinal Survey of Youth 1979, we explore the relationship between body mass and wages. We use quantile regression to provide a broad description of the relationship across the wage distribution. We also allow the relationship to vary by the degree of social skills involved in different jobs. Our results find that for female workers body mass and wages are negatively correlated at all points in their wage distribution. The strength of the relationship is larger at higher-wage levels. For male workers, the relationship is relatively constant across wage distribution but heterogeneous across ethnic groups. When controlling for the endogeneity of body mass, we find that additional body mass has a negative causal impact on the wages of white females earning more than the median wages and of white males around the median wages. Among these workers, the wage penalties are larger for those employed in jobs that require extensive social skills. These findings may suggest that labor markets reward white workers for good physical shape differently, depending on the level of wages and the type of job a worker has. Copyright © 2011 John Wiley & Sons, Ltd.
	Bibliography Citation Johar, Meliyanni and Hajime Katayama. "Quantile Regression Analysis of Body Mass and Wages." Health Economics 21,5 (May 2012): 597-611.

3.	Katayama, Hajime
3.	Three Essays on Applied Economics Ph.D. Dissertation, The Pennsylvania State University, 2003. DAI-A 64/09, p. 3416, Mar 2004 Cohort(s): NLSY97 Publisher: UMI - University Microfilms, Bell and Howell Information and Learning Keyword(s): Crime; Heterogeneity; Labor Economics; Modeling, Multilevel; Modeling, Probit This thesis consists of three essays. The first essay is joint work with Kala Krisha and Susumu Imai. Using data from the National Youth Survey, we examine the relationship of current criminal activity with past criminal activity, past arrests, and other variables. We estimate an ordered probit model, allowing for unobserved heterogeneity. We find that criminal types and non-criminal types behave very differently. An increase in arrests raises current criminal activity only for non-criminal types, while an increase in criminal experience raises current criminal activity for both types. For both types, arrests rise and then fall with age with a peak around age 18. The age crime profile also has this shape for non-criminal types, but for criminal types, it rises with age, suggesting lower apprehension rates for criminal types. The second essay looks at the pattern of young males' criminal activity, using data from the National Longitudinal Survey of Youth 97. A multivariate Tobit model with random effects is estimated to investigate whether current criminal acts of one type affect future criminal activity in the same or other categories. The results indicate such relationships indeed exist. In particular, I find evidence that minor crimes such as vandalism and minor theft are a stepping stone to more serious crimes. This suggests discouraging these will reduce future crime. The third essay is joint work with Shihua Lu and James Tybout. We develop an approach to measuring firms' performances. We assume firms' costs and revenues reflect a Bertrand-Nash equilibrium in a differentiated product industry. Given the demand system parameters, this allows us to impute each firm's unobserved marginal costs and product quality from its observed revenues and costs. Assuming that marginal costs and product quality indices follow vector autoregressive (VAR) processes, we jointly estimate the demand system parameters and VAR parameters using Bayesian techniques. Applying our methodology to panel data on Colombian pulp and paper plants, we find that conventional productivity measures are not closely related to quality measures and are nearly orthogonal to consumer surplus measures, suggesting that they may be poor characterizations of producer performance from a social welfare standpoint.
	Bibliography Citation Katayama, Hajime. Three Essays on Applied Economics. Ph.D. Dissertation, The Pennsylvania State University, 2003. DAI-A 64/09, p. 3416, Mar 2004.

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