scholarly journals A Cooperative Dynamic Approach to Pairs Trading

Complexity ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
J. P. Ramos-Requena ◽  
M. N. López-García ◽  
M. A. Sánchez-Granero ◽  
J. E. Trinidad-Segovia
Keyword(s):  
Stock Exchange ◽  
Pairs Trading ◽  
Dynamic Approach ◽  
Bull Markets ◽  
The Mean ◽  
High Degree ◽  
Positive Results

Based on recent works on stocks comovement, Pairs Trading’s strategy is enhanced by reducing the stock universe to the stocks with the lower volatility on a given date. From this universe of low volatility stocks, pairs are selected by looking for pairs whose series present a high degree of antipersistence. Finally, a “reversion to the mean” strategy is applied to these pairs. It is shown that, with this approach to Pairs Trading, positive results can be obtained for stock from the Nasdaq stock exchange, mainly during bull markets and low volatility periods.

scholarly journals A CHANGE OF THE LENGTH OF THE ANTERO-POSTERIOR AXIS OF THE EYE IN THE CHILDREN PRESENTING WITH HYPEROPIA FOLLOWING FEMTOSECOND LASER-ASSISTED IN SITU KERATOMILEUSIS: 3 YEAR FOLLOW-UP

2018 ◽  
Vol 13 (1) ◽  
pp. 31-37
Author(s):  
I. L Kulikova ◽  
N. P Pashtaev ◽  
Anastasiya Vladimirovna Gagloeva ◽  
O. V Shlenskaya ◽  
N. V Chapurin
Keyword(s):  
Femtosecond Laser ◽  
Mean Value ◽  
Minimal Growth ◽  
The Mean ◽  
Group 2 ◽  
Contralateral Eye ◽  
High Degree ◽  
Positive Results

Aim. The objective of the present study was the analysis of the changes in the length of the antero-posterior axis of the eye (AL) in the children and adolescents presenting with hyperopia and anisometropia in 3 years after femtolaser-assisted in situ keratomileusis (FS-LASIK). Material and methods. The study included 33 patients at the age from 5 to 16 years divided into two groups. Group 1 was comprised of the patients having initially the mean spherical refractive equivalent (SE) +3.69 D. Those of group 2 had initial SE +5.88 D. In all the patients, FS-LASIK was carried out at the amblyopic eye in the absence of the positive results of the conventional conservative treatment. Results. During three years after FS-LASIK, AL of the treated patients in the first group increased by 0.41 mm and reached the mean value of 22.41 mm while the spherical refractive equivalent became equal to 0.25 D. During the same period, AL in the contralateral eye increased by 0.92 mm and became equal to 23.47 mm on the average with SE equaling +0.81 D. AL of the patients in the second group increased by 0.29 mm and reached the mean value of 21.59 mm while the spherical refractive equivalent became equal to 0.25 D. During the same period, AL in the contralateral eye increased by 0.97 mm and became equal to 23.32 mm on the average with SE equaling +0.62 D. Conclusion. During three years after hyperopic S-LASIK, the minimal growth of the antero-posterior axis of the eye was documented in the children presenting with hyperopia (+5 D) whereas its length increased by more than 0.29 mm. In the children with hyperopia of less than +5 D, it increased by 0.41 mm. It is concluded that prognosis of the results of femtosecond laser-assisted in situ keratomileusis leading to the alteration of the refraction in the amblyopic eye with the initially moderate or high-degree hyperopia should be made taking into consideration that AL continues to change in the cource of further growth of the child.

scholarly journals Macrolide-Resistant and Macrolide-Sensitive Mycoplasma pneumoniae Pneumonia in Children Treated Using Early Corticosteroids

2021 ◽  
Vol 10 (6) ◽  
pp. 1309
Author(s):  
Hye Young Han ◽  
Ki Cheol Park ◽  
Eun-Ae Yang ◽  
Kyung-Yil Lee
Keyword(s):  
Mycoplasma Pneumoniae ◽  
Serological Test ◽  
Corticosteroid Treatment ◽  
23S Rrna ◽  
Laboratory Parameters ◽  
The Mean ◽  
Domain V ◽  
Positive Results ◽  
Mycoplasma Pneumoniae Pneumonia

We have found that early corticosteroid therapy was effective for reducing morbidity during five Korea-wide epidemics. We evaluated the clinical and laboratory parameters of 56 children who received early corticosteroid treatment for pneumonia that was caused by macrolide-resistant Mycoplasma pneumoniae (M. pneumoniae) or macrolide-sensitive M. pneumoniae between July 2019 and February 2020. All subjects had dual positive results from a PCR assay and serological test, and received corticosteroids within 24–36 h after admission. Point mutation of residues 2063, 2064, and 2067 was identified in domain V of 23S rRNA. The mean age was 6.8 years and the male:female ratio was 1.2:1 (31:25 patients). Most of the subjects had macrolide-resistant M. pneumoniae (73%), and all mutated strains had the A2063G transition. No significant differences in clinical and laboratory parameters were observed between macrolide-resistant and macrolide-sensitive M. pneumoniae groups that were treated with early dose-adjusted corticosteroids. Higher-dose steroid treatment may be needed for patients who have fever that persists for >48 h or increased biomarkers such as lactate dehydrogenase concentration at follow-up despite a usual dose of steroid therapy.

scholarly journals Perception of the Online Learning Environment of Nursing Students in Slovenia: Validation of the DREEM Questionnaire

Healthcare ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 998
Author(s):  
Lucija Gosak ◽  
Nino Fijačko ◽  
Carolina Chabrera ◽  
Esther Cabrera ◽  
Gregor Štiglic
Keyword(s):  
Nursing Students ◽  
Nursing Student ◽  
Student Perception ◽  
Psychometric Testing ◽  
Educational Environment ◽  
Educational Process ◽  
Survey Questionnaire ◽  
Self Perception ◽  
The Mean ◽  
High Degree

At the time of the outbreak of the coronavirus pandemic, several measures were in place to limit the spread of the virus, such as lockdown and restriction of social contacts. Many colleges thus had to shift their education from personal to online form overnight. The educational environment itself has a significant influence on students’ learning outcomes, knowledge, and satisfaction. This study aims to validate the tool for assessing the educational environment in the Slovenian nursing student population. To assess the educational environment, we used the DREEM tool distributed among nursing students using an online platform. First, we translated the survey questionnaire from English into Slovenian using the reverse translation technique. We also validated the DREEM survey questionnaire. We performed psychometric testing and content validation. I-CVI and S-CVI are at an acceptable level. A high degree of internal consistency was present, as Cronbach’s alpha was 0.951. The questionnaire was completed by 174 participants, of whom 30 were men and 143 were women. One person did not define gender. The mean age of students was 21.1 years (SD = 3.96). The mean DREEM score was 122.2. The mean grade of student perception of learning was 58.54%, student perception of teachers was 65.68%, student academic self-perception was 61.88%, student perception of the atmosphere was 60.63%, and social self-perception of students was 58.93%. Although coronavirus has affected the educational process, students still perceive the educational environment as positive. Nevertheless, there is still room for improvement in all assessed areas.

scholarly journals Assessment of costs and insurance policies for referral treatment of equine colic

2019 ◽  
Vol 185 (16) ◽  
pp. 508-508 ◽  
Author(s):  
Isobel Barker ◽  
Sarah L Freeman
Keyword(s):  
Surgical Treatment ◽  
Insurance Companies ◽  
Insurance Policies ◽  
Insurance Cover ◽  
Survey Costs ◽  
The Mean ◽  
High Degree ◽  
Mean Cost ◽  
Monthly Premium ◽  
Equine Colic

Colic is the most common emergency problem in horses. The aims of this study were to survey costs of different referral treatments and to review insurance policies relevant to horses with colic. Data were collected retrospectively from nine equine hospitals for case costs, categorised into four different outcomes: admitted and euthanased; euthanased during or immediately after surgery; medical treatment and survived more than 24 hours; and surgical treatment and survived more than 24 hours. Data from five UK equine insurance companies were extracted and analysed using a standardised case example. Costs were obtained for 108 cases. The mean cost for horses admitted and euthanased was £873.89 (range £459.72–£1471.51), and for surgical treatment and survival more than 24 hours was £6437.80 (range £3178.87–£9100.00). Insurance cover for veterinary fees ranged from £5000 to £7500, and monthly premium rates for a standardised case ranged from £27.06 to £47.06. The terms and conditions for the insurance policies ranged in length from 2098 to 17,701 words; Flesch Kincaid Reading Ease scores ranged from 21.6 to 57.7, indicating a high degree of complexity and low readability. This study highlights the complexity and challenges for decision-making in critical cases of colic.

Responses of the bovine teat to machine milking: measurement of changes in thickness of the teat apex

1988 ◽  
Vol 55 (3) ◽  
pp. 331-338 ◽  
Author(s):  
Jörn Hamann ◽  
Graeme A. Mein
Keyword(s):  
Positive Pressure ◽  
Vacuum Level ◽  
Machine Milking ◽  
Before And After ◽  
The Mean ◽  
High Degree

SummaryChanges in the teat apex before and after different milking treatments were measured with a spring-loaded caliper device known as a cutimeter which could detect changes in thickness of the tissues of the teat end, presumably due to congestion and/or oedema, with a high degree of accuracy (± 2%) and repeatability (r = 0·99). Teat end thickness increased with increasing vacuum level. The mean increase immediately after milking with a conventional cluster was 2% for 24 teats milked at 30 kPa, 8% at 50 kPa and 21% at 70 kPa. At these vacuum levels, the mean increases for the same teats milked with an unconventional (PKME) teatcup were 10, 18 and 25% respectively. Cyclic application of 35 kPa positive pressure to the pulsation chamber of a conventional teatcup operating at 50 kPa reduced teat end thickness by 8% compared with the mean premilking value. Although most teats returned to within ± 2% of their premilking thickness values by 1 h after milking, differences were apparent between different milking systems for up to 4 h postmilking.

Determination of Sample Size in Service Inspection

1997 ◽  
Vol 119 (1) ◽  
pp. 57-60
Author(s):  
S. Qin ◽  
G. E. O. Widera
Keyword(s):  
Sample Size ◽  
Large Volume ◽  
Analysis Method ◽  
Degree Of Confidence ◽  
Impossible Task ◽  
The Mean ◽  
High Degree ◽  
Service Inspection ◽  
False Rejection

When performing inservice inspection on a large volume of identical components, it becomes an almost impossible task to inspect all those in which defects may exist, even if their failure probabilities are known. As a result, an appropriate sample size needs to be determined when setting up an inspection program. In this paper, a probabilistic analysis method is employed to solve this problem. It is assumed that the characteristic data of components has a certain distribution which can be taken as known when the mean and standard deviations of serviceable and defective sets of components are estimated. The sample size can then be determined within an acceptable assigned error range. In this way, both false rejection and acceptance can be avoided with a high degree of confidence.

scholarly journals Glaucoma characteristics evaluation in myopia – A clinical study

2021 ◽  
Vol 7 (2) ◽  
pp. 195-199
Author(s):  
Helen Rosita J ◽  
Gnanaselvan J ◽  
Amudhavadivu S ◽  
Anna Kurian Mullasseril
Keyword(s):  
Optic Nerve ◽  
Optic Nerve Head ◽  
High Myopia ◽  
Intra Ocular Pressure ◽  
Significant Difference ◽  
Long Term Follow Up ◽  
Ocular Pressure ◽  
The Mean ◽  
One Year ◽  
High Degree

Glaucoma is the leading cause of irreversible blindness, one of the risk factor recognised being high myopia. Intra ocular pressure may be normal in myopic patients, with optic nerve head glaucoma characteristics. Eye ball elongation and optic nerve head tilting may be present in patients with high myopia that will represent field defects mimicking glaucoma. Treating patients with myopia having suspected aspects of glaucoma may be a challenge but even more challenging is the diagnosis of glaucoma in myopic patients.: To evaluate the association of glaucoma features with myopia. To create the awareness regarding the long term follow up.: Patients in the age group of 15 to 45 years who had attended our institution over a period of one year who fulfilled the inclusion and exclusion criteria were subjected for this study. Fifty four patients who were diagnosed to have moderate or high degree myopia were selected for this analytical study. They were subjected to vision, ocular examination, tonometry and results obtained were analysed.: In our study moderate myopes constituted 55.5% and high myopes were 44.5%. The mean Intra ocular pressure and the mean corrected Intra ocular pressure in high myopes were observed to be higher than in moderate myopia. It was observed that higher prevalence of glaucoma was observed in high myopes.: There is a clinically as well as statistically significant difference between mean Intra ocular pressure and mean corrected Intra ocular pressure. So mean corrected Intra ocular pressure should be measured .From our study, there is a clear indication that there is increased prevalence of glaucoma in high myopes.

scholarly journals Semi-monthly effect in stock returns: new evidence from Bombay Stock Exchange

2017 ◽  
Vol 14 (3) ◽  
pp. 160-172 ◽  
Author(s):  
Shakila B. ◽  
Prakash Pinto ◽  
Iqbal Thonse Hawaldar
Keyword(s):  
Health Care ◽  
Stock Returns ◽  
Stock Exchange ◽  
Consumer Durables ◽  
Empirical Results ◽  
Significant Difference ◽  
The Mean ◽  
Daily Stock Returns ◽  
New Evidence ◽  
Care Index

Semi-monthly effect is a kind of calendar anomalies which is less explored in the financial literature. The main objective of this paper to investigate the presence of semi-monthly effect in selected sectoral indices of Bombay Stock Exchange (BSE). The study uses the daily stock returns of five sectoral indices viz S&P BSE Auto Index, S&P BSE Bankex, S&P BSE Consumer Durables Index, S&P BSE FMCG Index and S&P BSE Health Care Index for the period of 10 years starting from 1st April 2007 to 31st March 2017. The data were analyzed using two approaches namely calendar days approach and trading days approach. To test the equality of mean returns for the two halves of the month, Mann-Whitney U test is used. The empirical results of the study did not provide any evidence for the presence of semi-monthly effect in the selected sectoral indices. Nevertheless, BSE Auto Index showed significant difference in the mean returns of first half and second half of trading month during the study period.

scholarly journals Comparison of power of modified Jarque-Bera normality tests and selected tests of normality

2008 ◽  
Vol 56 (6) ◽  
pp. 137-148 ◽  
Author(s):  
Luboš Střelec
Keyword(s):  
Stock Exchange ◽  
Financial Time Series ◽  
Simulation Studies ◽  
Test Paper ◽  
Monthly Average ◽  
Financial Time ◽  
Uniform Distributions ◽  
Source Data ◽  
The Mean ◽  
Heavy Tailed

The aim of this paper is to modify the classical Jarque-Bera test and the robust Jarque-Bera test of normality. We use the median as an estimator instead of the mean in the classical Jarque-Bera test and in the robust Jarque-Bera test. This leads to the modified Jarque-Bera test and the modified robust Jarque-Bera test. Paper also demonstrates results of simulation studies of power of such tests with the various alternatives – light tailed alternatives as exponential, lognormal and gamma distribution, heavy tailed alternatives as Cauchy, Laplace, t3, t5 and logistic distributions and short tailed alternatives as beta and uniform distributions. These tests of normality are also used for normality testing of selected datasets of financial time series. Source data include logarithmic returns of monthly ave­ra­ge prices of Prague stock exchange index PX and monthly average prices of CZK/EUR exchange rate in the period from 2000 to 2007.

scholarly journals Portfolio Selection and Performance Evaluation Through Benjamin Graham’s Value Investing

2020 ◽  
Vol 4 (2) ◽  
pp. 11-16
Author(s):  
Vinay Kumar Srivastava ◽  
Nitin Kulshrestha
Keyword(s):  
Stock Exchange ◽  
Practical Implication ◽  
Jel Classification ◽  
Value Investing ◽  
The Mean ◽  
And Performance ◽  
Indian Stock Market ◽  
The Empirical Analysis ◽  
Practical Impact ◽  
Passive Strategy

Purpose: The objective of this study is to validate the value investing concerning filtering valued stock in the Indian stock market (Nifty 50) & United States (Dow Jones) during the period 2014 -20. Design /Methodologies/Approach:  We have selected the data of the National Stock Exchange and Dow Jones to apply the value investing technique for choosing the stocks and building a significant portfolio. Further, we compare the mean returns of B & H passive strategy. The empirical analysis includes the selected portfolio from Jan 2014 to May 2020. Results & Practical Implication: The mean return of portfolio selected by Value investing outperform as comparative to passive strategy, i.e. Buy & Hold strategy. The successful application of value investing will encourage the practitioners & academicians of financial markets to research & explore further uses & practical impact of the present study. JEL Classification Codes: F37.                          

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