A Comparison of Two-Stage Least Squares (TSLS) and Ordinary Least Squares (OLS) in Estimating the Structural Relationship between After-School Exercise and Academic Performance

The current study examines the structural relationship between the academic performance exam scores of Korean middle school students and their after-school exercise hours. Although prior literature theoretically or experimentally predicts that these variables are positively associated, this association is difficult to empirically verify without controlling for mutual effects with other variables, or unless a full model is estimated by specifying the whole structure of all variables affecting the two variables in question. Unlike previous studies, this study estimates the structural relationship using two-stage least squares method, which does not require experimental observations collected for our particular purpose or estimating the full model. From this estimation, we empirically affirm that there is a positive structural relationship between students’ after-school exercise hours and their academic performance exam scores, whereas the ordinary least squares method consistently estimates a negative relationship.

Intergenerational Mobility of Earnings and Income among Sons and Daughters in Vietnam

<p>In this thesis, I investigate intergenerational mobility of earnings and income among sons and daughters in Vietnam. In particular, my objective is to estimate intergenerational elasticity (IGE) of sons’ and daughters’ individual earnings, individual income, and family income with respective to father’s individual earnings. The two-sample two-stage least squares (TS2SLS) estimation is employed to achieve the research objective using two primary samples of father-son pairs and father-daughter pairs from Vietnam Household Living Standard Surveys (VHLSS) of 2012 and one secondary sample from Vietnam Living Standard Surveys (VLSS) of 1997-98. My results show that the baseline IGE estimates of Vietnamese sons are 0.361, 0.394 and 0.567 for individual earnings, individual income, and family income, respectively. For Vietnamese daughters, the baseline IGE estimates are 0.284, 0.333 and 0.522 for individual earnings, individual income, and family income, respectively. These IGE estimates explicitly reveal that Vietnam has the intermediate degrees of individual earnings and individual income mobility, and the low degree of family income mobility cross generations for both sons and daughters by the international comparison.</p>

Intergenerational Mobility of Earnings and Income among Sons and Daughters in Vietnam

<p>In this thesis, I investigate intergenerational mobility of earnings and income among sons and daughters in Vietnam. In particular, my objective is to estimate intergenerational elasticity (IGE) of sons’ and daughters’ individual earnings, individual income, and family income with respective to father’s individual earnings. The two-sample two-stage least squares (TS2SLS) estimation is employed to achieve the research objective using two primary samples of father-son pairs and father-daughter pairs from Vietnam Household Living Standard Surveys (VHLSS) of 2012 and one secondary sample from Vietnam Living Standard Surveys (VLSS) of 1997-98. My results show that the baseline IGE estimates of Vietnamese sons are 0.361, 0.394 and 0.567 for individual earnings, individual income, and family income, respectively. For Vietnamese daughters, the baseline IGE estimates are 0.284, 0.333 and 0.522 for individual earnings, individual income, and family income, respectively. These IGE estimates explicitly reveal that Vietnam has the intermediate degrees of individual earnings and individual income mobility, and the low degree of family income mobility cross generations for both sons and daughters by the international comparison.</p>

HỆ THỐNG CHỈ SỐ CẢNH BÁO SỚM KHỦNG HOẢNG TIỀN TỆ VÀ KHỦNG HOẢNG NGÂN HÀNG TẠI VIỆT NAM

Dựa trên quan điểm thận trọng, nghiên cứu này tích hợp bốn cách tiếp cận Signal, Logit/Probit, BMA (Bayesian Model Averaging) và 2SLS (Two Stage Least Squares) để phát triển hệ thống các chỉ số cảnh báo sớm (Early Warning Indicators – EWI) về khủng hoảng tiền tệ (KHTT) và khủng hoảng ngân hàng (KHNH) tại Việt Nam. Kết quả nghiên cứu cho thấy vai trò quan trọng của các chỉ số kinh tế vĩ mô trong cảnh báo sớm KHTT và KHNH tại Việt Nam, đặc biệt là 8 chỉ số, bao gồm chỉ số giá chứng khoán, tỷ giá thực đa phương, xuất khẩu, M2/dự trữ ngoại hối, tiền gửi ngân hàng, dự trữ ngoại hối, số nhân cung tiền M2 và tác động của khủng hoảng tài chính (KHTC) toàn cầu. Thêm vào đó, nghiên cứu cũng tìm thấy bằng chứng về mối quan hệ nhân quả hai chiều giữa KHTT và KHNH tại Việt Nam, đồng thời cung cấp bằng chứng thực nghiệm về tác động của hiện tượng đô la hóa đến khả năng xảy ra KHTT và tác động mạnh mẽ của KHTC toàn cầu đến khả năng xảy ra KHTT và KHNH tại các nền kinh tế mới nổi nhỏ và mở cửa như Việt Nam.

The Causal Interpretation of Two-Stage Least Squares with Multiple Instrumental Variables

Empirical researchers often combine multiple instrumental variables (IVs) for a single treatment using two-stage least squares (2SLS). When treatment effects are heterogeneous, a common justification for including multiple IVs is that the 2SLS estimand can be given a causal interpretation as a positively weighted average of local average treatment effects (LATEs). This justification requires the well-known monotonicity condition. However, we show that with more than one instrument, this condition can only be satisfied if choice behavior is effectively homogeneous. Based on this finding, we consider the use of multiple IVs under a weaker, partial monotonicity condition. We characterize empirically verifiable sufficient and necessary conditions for the 2SLS estimand to be a positively weighted average of LATEs under partial monotonicity. We apply these results to an empirical analysis of the returns to college with multiple instruments. We show that the standard monotonicity condition is at odds with the data. Nevertheless, our empirical checks reveal that the 2SLS estimate retains a causal interpretation as a positively weighted average of the effects of college attendance among complier groups. (JEL C26, I23, I26, J24, J31, R23)

MENSURANDO A DIFERENÇA SALARIAL ENTRE MULHERES COM FILHOS AINDA CRIANÇA

O mercado de trabalho vem apresentando transformações persistentes ao longo das décadas. No Brasil essa transformação, principalmente com a revolução eletrônica, se intensificou a partir da abertura comercial e financeira do início dos anos 1990. Além do mais, a inserção da mulher na procura de vagas de emprego cresceu nas últimas duas décadas. Porém, mesmo apresentando características semelhantes aos homens, as mulheres recebem salários menores. Outra questão para as mulheres é a maternidade, a legislação na maior parte dos países, inclusive a brasileira, no momento da entrevista de emprego perguntar sobre os planos de engravidar é proibido, porém na prática isso não acontece e as mulheres acabam perdendo oportunidades de emprego. Já a realidade demonstra que as mulheres que apresentam filhos menores têm dificuldades em encontrar empregos e seus salários podem ser menores. Assim, esse estudo procura obter respostas empíricas sobre a questão dos salários das mulheres. O objetivo central é, através de um modelo econométrico com base em Mincer (1974), testar os instrumentos de educação dos pais, background familiar, desemprego, horas de trabalho entre outras, em uma regressão do tipo Two-Stage least squares (2SLS) que visa analisar a estrutura das equações e melhorar os preditores. Os resultados apontaram que as mulheres com filhos menores de 6 anos recebem entre 58% a 85%, dependendo da especificação, menores salários do que as mulheres que não tem filhos pequenos.

Voluntary appointment of independent directors: evidence from Taiwan

Purpose Using a data set of Taiwanese listed firms from 2002 to 2015, this paper aims to examine the determinants to voluntarily appoint independent directors. Design/methodology/approach This study uses panel estimation to exploit both the cross-section and time-series nature of the data. Further, this paper uses Tobit regression, generalized linear model (GLM) in the additional analysis and the two-stage least squares to mitigate for a possible endogeneity issue. Findings The main findings show that Taiwanese firms with large board sizes tend to voluntarily appoint independent directors and firms that already have independent supervisors more willingly to accept additional independent directors onto the board. Furthermore, ownership concentration and institutional ownership are positively associated with the voluntary appointment of independent directors. On the contrary, firms controlled by family members are generally reluctant to voluntarily appoint independent directors. Research limitations/implications The findings are important for managers, shareholders, creditors and policymakers. In particular, when considering the determinants of the voluntary appointment of independent directors, the results indicate that independent supervisors, outside shareholders and institutional investors are significant factors in influencing effective internal and external corporate governance mechanisms. This research work focuses on the voluntary appointment of independent directors. It would be interesting to compare the effectiveness of voluntary appointments with a mandatory appointment within Taiwan and with other jurisdictions. Originality/value This study incrementally contributes to the corporate governance literature in several ways. First, this study extends the earlier research by using a more comprehensive data set of non-financial Taiwanese firms and using alternative methodologies to investigate the determinants of voluntary appointment of independent directors. Second, prior studies tend to neglect the possible issue of using a censored and fractional dependent variable, the proportion of independent directors, which might yield biased and inconsistent parameter estimates when using ordinary least squares regression estimation. Finally, this study addresses the relevant econometric issues by using the Tobit, GLM and the two-stage least squares for a possible endogeneity concern.

E-money and Stock: Empirical Evidence from Indonesia and Thailand

E-money is a type of electronic or digital payment that replaces cash payments. These technological developments will have an impact on reducing the use of cash. The use of e-money possibly affects stock, which is a form of securities. Therefore, the purpose of this study is to assess the relationship between e-money and stock. The study uses the two-stage least squares model to analyze quarterly data for 2011Q1-2019Q4. The study found no relationship between stock and e-money in Indonesia, whereas, in Thailand, there was a relationship between stock and e-money. There is no relationship between e-money and stock in Indonesia and Thailand. The study recommends the Indonesian government or central bank adopt the policies that Thailand has implemented in stock that affects e-money. Stocks can affect the use of e-money due to the profits or losses of the stock that will impact the use of e-money.JEL Classification: D53, E40How to Cite:Aimon, H., Sentosa, S. U., & Mahatir, M. R. (2021). E-money and Stock: Empirical Evidence from Indonesia and Thailand. Signifikan: Jurnal Ilmu Ekonomi, 10(1), 139-148. https://doi.org/10.15408/sjie.v10i1.15380.