REANALYSIS OF THE GRAVITATIONAL MICROLENSING EVENT MACHO-97-BLG-41 BASED ON COMBINED DATA

OBJECTIVEA recent retrospective study of severe traumatic brain injury (TBI) in pediatric patients showed similar outcomes in those with a Glasgow Coma Scale (GCS) score of 3 and those with a score of 4 and reported a favorable long-term outcome in 11.9% of patients. Using decision tree analysis, authors of that study provided criteria to identify patients with a potentially favorable outcome. The authors of the present study sought to validate the previously described decision tree and further inform understanding of the outcomes of children with a GCS score 3 or 4 by using data from multiple institutions and machine learning methods to identify important predictors of outcome.METHODSClinical, radiographic, and outcome data on pediatric TBI patients (age < 18 years) were prospectively collected as part of an institutional TBI registry. Patients with a GCS score of 3 or 4 were selected, and the previously published prediction model was evaluated using this data set. Next, a combined data set that included data from two institutions was used to create a new, more statistically robust model using binomial recursive partitioning to create a decision tree.RESULTSForty-five patients from the institutional TBI registry were included in the present study, as were 67 patients from the previously published data set, for a total of 112 patients in the combined analysis. The previously published prediction model for survival was externally validated and performed only modestly (AUC 0.68, 95% CI 0.47, 0.89). In the combined data set, pupillary response and age were the only predictors retained in the decision tree. Ninety-six percent of patients with bilaterally nonreactive pupils had a poor outcome. If the pupillary response was normal in at least one eye, the outcome subsequently depended on age: 72% of children between 5 months and 6 years old had a favorable outcome, whereas 100% of children younger than 5 months old and 77% of those older than 6 years had poor outcomes. The overall accuracy of the combined prediction model was 90.2% with a sensitivity of 68.4% and specificity of 93.6%.CONCLUSIONSA previously published survival model for severe TBI in children with a low GCS score was externally validated. With a larger data set, however, a simplified and more robust model was developed, and the variables most predictive of outcome were age and pupillary response.

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Quasar Image Shifts Resulting from Gravitational Microlensing

The Astrophysical Journal ◽

10.1086/305860 ◽

1998 ◽

Vol 501 (2) ◽

pp. 478-485 ◽

Cited By ~ 23

Author(s):

Geraint F. Lewis ◽

Rodrigo A. Ibata

Keyword(s):

Gravitational Microlensing

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MACHO Alert 95‐30: First Real‐Time Observation of Extended Source Effects in Gravitational Microlensing

The Astrophysical Journal ◽

10.1086/304974 ◽

1997 ◽

Vol 491 (2) ◽

pp. 436-450 ◽

Cited By ~ 119

Author(s):

C. Alcock ◽

W. H. Allen ◽

R. A. Allsman ◽

D. Alves ◽

T. S. Axelrod ◽

...

Keyword(s):

Real Time ◽

Extended Source ◽

Source Effects ◽

Gravitational Microlensing ◽

Time Observation ◽

Real Time Observation

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Queens of the Desert: Convictism and Marital Attitudes across Australia

AEA Papers and Proceedings ◽

10.1257/pandp.20201120 ◽

2020 ◽

Vol 110 ◽

pp. 457-462

Author(s):

Victoria Baranov ◽

Ralph De Haas ◽

Pauline Grosjean

Keyword(s):

Nineteenth Century ◽

Social Norms ◽

Spatial Variation ◽

Survey Data ◽

Household Survey ◽

Same Sex ◽

Same Sex Marriage ◽

Founder Populations ◽

Household Survey Data ◽

Combined Data

We merge data on spatial variation in the presence of convicts across eighteenth and nineteenth century Australia with results from the country's 2017 poll on same-sex marriage and with household survey data. These combined data allow us to identify the lasting impact of convict colonization on social norms about marriage. We find that in areas with higher historical convict concentrations, more Australians recently voted in favor of same-sex marriage and hold liberal views about marriage more generally. Our results highlight how founder populations can have lasting effects on locally held social norms.

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Dark Matter Search with Gravitational Microlensing Events

Progress of Theoretical Physics Supplement ◽

10.1143/ptps.133.211 ◽

1999 ◽

Vol 133 ◽

pp. 211-231

Author(s):

Ryoichi Nishi ◽

Kunihito Ioka ◽

Yukitoshi Kan-ya

Keyword(s):

Dark Matter ◽

Dark Matter Search ◽

Gravitational Microlensing

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Branching Ratios and Lifetimes of 25Mg Levels below 5.2 MeV

Canadian Journal of Physics ◽

10.1139/p74-304 ◽

1974 ◽

Vol 52 (23) ◽

pp. 2329-2342 ◽

Cited By ~ 14

Author(s):

R. W. Ollerhead ◽

D. C. Kean ◽

R. M. Gorman ◽

M. B. Thomson

Keyword(s):

Doppler Shift ◽

Gamma Ray ◽

Branching Ratios ◽

Surface Barrier ◽

Surface Barrier Detector ◽

Rotational Model ◽

Rotational Bands ◽

Barrier Detector ◽

Combined Data

All levels below 5.2 MeV in 25Mg have been studied using the reaction 25Mg(p, p′γ). In-elastically scattered protons were detected in an annular surface barrier detector located at 180°; coincidence gamma-ray spectra were obtained at Ge (Li) detector angles of 90°, 45°, and 135°. Level energies were determined from unshifted gamma-ray energies recorded in the 90° spectra. Lifetimes were obtained from the attenuated Doppler shift of gamma-ray energies recorded in spectra taken at forward and backward angles. Branching ratios were deduced from the combined data of all three angles. The identification of levels as members of rotational bands is discussed, and transition strengths deduced from the present measurements are compared with predictions of the simple rotational model.

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Are Family Firms More Levered? An Analysis of Family and Non-Family Firms

SAGE Open ◽

10.1177/21582440211022322 ◽

2021 ◽

Vol 11 (2) ◽

pp. 215824402110223

Author(s):

Jahanzaib Haider ◽

Abdul Qayyum ◽

Zalina Zainudin

Keyword(s):

Family Firms ◽

East Asian ◽

Ordinary Least Squares ◽

Maturity Structure ◽

The Family ◽

Asian Economies ◽

The Board Of Directors ◽

East Asian Economies ◽

Combined Data

This study analyzes the leverage policies of the family and non-family firms of eight East Asian Economies (Hong Kong, Indonesia, Japan, Korea, Malaysia, Philippines, Singapore, and Taiwan) by using combined data of 690 family and non-family firms with 3,224 firm–years over the period 2006–2010. This study has used an ordinary least squares (OLS) regression for analyzing the data for the first question, while for the second question, logit regression has been used as the dependent variable (a binary variable). Prior research on family and non-family firms has revealed that family firms issue less (high) debt than non-family firms. Our analysis on a sample of East Asian Economies discloses that family firms have significantly different leverage levels than non-family firms, but their signs are not consistent. On the contrary, when the owner works as CEO/Chairman or member of the Board of Directors, then the family firms issue less debt than the non-family firms. Besides that, this study adds a new question that has not been addressed in the prior studies. The new question has focused on the speed of leverage adjustment. It is found that family firms and non-family firms regarding their debt maturity structure (short-term debt and long-term debt), the speed of leverage adjustments, and their decision to issue securities (i.e., debt vs. equity) are not significantly different. This study concluded that though family firms have a strong influence on each economy, but in South-East Asian countries, leverage policies of the family firms are not much different than that of non-family firms.

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