نتایج جستجو برای: g23

تعداد نتایج: 288  

ژورنال: :به نژادی نهال و بذر 0
رضا محمدی r. mohammadi deputy dryland agricultural research institute, kermanshah, iran.معاونت موسسه تحقیقات کشاورزی دیم، کرمانشاه محمد آرمیون m. armion اسماعیل زادحسن e. zadhasan ملک مسعود احمدی m. m. ahmadi داود صادق زاده اهری d. sadeghzadeh ahari

در این بررسی 25 ژنوتیپ گندم شامل 22 لاین پیشرفته گندم دوروم، دو رقم شاهد گندم دوروم (ساجی و زردک) و یک رقم شاهد گندم نان (سرداری) در 19 محیط مختلف شامل ایستگاه های تحقیقات کشاورزی دیم سرارود (کرمانشاه)، شیروان چرداول (ایلام)، مراغه و شیروان (خراسان شمالی) طی چهار سال زراعی (89-1385) در شرایط دیم و آبیاری تکمیلی مورد آزمایش و بررسی قرار گرفتند. بزرگی اثر متقابل ژنوتیپ × محیط نسبت به ژنوتیپ در تج...

2002
Andrew W. Lo A. Craig MacKinlay June Zhang

We develop and estimate an econometric model of limit-order execution times using survival analysis and actual limit-order data. We estimate versions for time-to-first-fill and time-to-completion for both buy and sell limit orders, and incorporate the effects of explanatory variables such as the limit price, limit size, bid/offer spread, and market volatility. Execution times are very sensitive...

2004
Laurence Booth

This paper looks at standard retirement targets such as “70@65,” meaning 70% income replacement at age 65, and reconsiders them in a probabilistic setting. The paper uses a chance constrained programming model, supplemented with Monte Carlo simulation, to extend the target to “70% of 70@65” meaning a 70% chance of meeting the target. One implication of the paper is that asset mix is a function ...

2009
Ke Tang Wenjun Wang

Using detailed stockholding for a comprehensive sample of Chinese mutual funds from 2004 to 2009, we investigate the economy of scale and liquidity on the relation between fund size and performance. We find that there exists an inverted U-shape relation between fund size and performance accounting for various performance benchmarks. Both economy of scale and liquidity exist and play an importan...

2006
Reena Aggarwal Sandeep Dahiya Leora Klapper

What motivates investors to hold American Depositary Receipts (ADRs) rather than the underlying stock of U.S. listed foreign firms? We analyze the investment allocation decision of actively-managed emerging market mutual fund managers. Although legal provisions are typically assumed to affect ADR and its underlying domestic shares equally, investors holding ADRs may have a higher level of legal...

1999
Richard Disney Robert Palacios Edward Whitehouse

The paper examines social security (public pension) reforms in which the programme is partially shifted from a public unfunded basis to a private, prefunded, basis. It focuses on reforms where individuals have a choice in switching from public funded to private unfunded programmes (as in the ‘contracting out’ scheme in the UK), or where some individuals are forced to join the funded scheme, or ...

2010
Massimo Massa Lei Zhang

We study how organizational complexity affects managerial behavior, breaking it down into vertical hierarchy and degree of specialization. We exploit a novel dataset on the organizational structure of the US asset management industry. We show that more hierarchical structures reduce the incentive to collect soft information by investing less in closely-located firms. This reduces portfolio conc...

2004
Thomas Gehrig

This paper analyzes the behaviour and motivation of fund managers in foreign exchange markets reflected in questionnaire evidence. We find that fund managers and FX dealers differ significantly. Fund managers rely more on fundamentals, basically due to their longer forecasting horizons, and reject non-fundamental influences on exchange rates more than FX dealers. However, neither can fund manag...

2000
Peter C. Schotman Mark Schweitzer

In this paper, we study the potential of stocks as a hedge against inflation for different investment horizons. We show that stocks can be a hedge against inflation even if stock returns are negatively correlated with unexpected inflation shocks, and only moderately positively related to expected inflation. Depending on the investment horizon, the optimal hedge ratio can be either positive or n...

2012
Konstantina Pendaraki

The mutual fund industry has experienced huge growth internationally, becoming one of the primary vehicles through which individuals and most institutions invest in capital markets. Thus, the evaluation of the performance of mutual funds has become a very interesting research topic both for academic researchers for managers of financial, banking and investment institutions. This paper proposes ...

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