Preliminary statistical studies of the infraspecific variation in the ascospores of Nesolechia oxyspora growing on different genera of parmelioid lichens

2006 ◽  
Vol 38 (5) ◽  
pp. 425-434 ◽  
Author(s):  
Caroline J. DORÉ ◽  
Mariette S. COLE ◽  
David L. HAWKSWORTH
Keyword(s):  
Regression Analysis ◽  
Statistical Analysis ◽  
Pilot Study ◽  
Extensive Study ◽  
Host Specialization ◽  
Standard Errors ◽  
Infraspecific Variation ◽  
Independent Variables ◽  
Statistical Studies ◽  
Sandwich Estimators

In order to ascertain the extent of possible host-specialization in the Nesolechia oxyspora complex, as a pilot study ascospores from 20 collections from different parmelioid hosts representing seven genera were drawn, measured, and had length:breadth ratios calculated. The data were then subjected to multiple regression analysis using Huber-White sandwich estimators of standard errors (apparently not previously used in mycology) which take account of spores not necessarily being independent variables as they might come from the same ascus, and a statistical analysis. Significant differences between collections from seven genera were found. While the sample size was too small to reach definite conclusions, it is clear that there is a finer degree of host-relatedness than hitherto expected, which may be geno- or phenotypic. A more extensive study including species from a wider range of hosts and complemented by molecular methods will be necessary to further elucidate degrees of specificity and cryptic co-speciation in the complex. A list of the 63 reported lichen hosts is included; these are distributed though 19 genera.

White-Collar Crime Defence Knowledge: Predictors of Lawyer Fame

2014 ◽  
Vol 13 (01) ◽  
pp. 1450001
Author(s):  
Petter Gottschalk
Keyword(s):  
Regression Analysis ◽  
Statistical Analysis ◽  
White Collar Crime ◽  
White Collar ◽  
Upper Class ◽  
Financial Crime ◽  
Statistical Regression ◽  
Legal Principles ◽  
Independent Variables ◽  
The Law

The white-collar crime attorney is a lawyer who is competent in general legal principles and in the substantive and procedural aspects of the law related to upper-class financial crime. Based on a sample of 310 convicted white-collar criminals and their defence lawyers, this paper presents results from statistical analysis of relationships between crime characteristics and defence characteristics to predict lawyer fame. Statistical regression analysis was applied to the sample, where amount of crime money and years in prison represent crime characteristics, while number of client cases and lawyer income represent defence characteristics. About 91% of the variation in attorney fame is explained by these four independent variables.

scholarly journals PENERAPAN REGRESI ZERO INFLATED POISSON UNTUK MENGATASI OVERDISPERSI PADA REGRESI POISSON (Studi Kasus: Ketidaklulusan Siswa SMA/MA dalam Ujian Nasional di Buleleng)

2013 ◽  
Vol 2 (3) ◽  
pp. 23
Author(s):  
LUH KOMANG MARDIANI ◽  
KOMANG GDE SUKARSA ◽  
I GUSTI AYU MADE SRINADI
Keyword(s):  
High School ◽  
Regression Analysis ◽  
Count Data ◽  
Poisson Regression ◽  
Regression Models ◽  
Senior High School ◽  
Standard Errors ◽  
Poisson Regression Analysis ◽  
Independent Variables ◽  
Regression Methods

The Poisson regression analysis is one of the regression methods used for count data and has the assumption of equidispersion. However, it is the overdispersion and then underestimate standard errors will be obtained. If the data are overdispersed and more data is zero then ZIP (Zero Inflated Regression) regression is used. ZIP regression model is more appropriate to be used to analyze the amount of Senior High School/Madrasah Aliyah who do not pass the exam with five independent variables, because a lot of data failure is zero. In this paper, data are overdispersed on Poisson regression, so ZIP regression are used. ZIP regression models obtained are only influenced by the proportion of Senior High School/Madrasah Aliyah classroom were damaged (X3), is and .

scholarly journals A REVIEW ON THE USE OF REGRESSION ANALYSIS IN STUDIES OF AUDIT QUALITY

2015 ◽  
Vol 1 (1) ◽  
pp. 107
Author(s):  
Agung Dodit Muliawan
Keyword(s):  
Regression Analysis ◽  
Statistical Analysis ◽  
Multiple Regression Analysis ◽  
Multiple Regression ◽  
Audit Quality ◽  
Research Articles ◽  
Anglo Saxon ◽  
Multiple Regressions ◽  
Independent Variables ◽  
Anglo American

This study aimed to review how regression analysis has been used in studies of abstract phenomenon, such as audit quality, an importance concept in the auditing practice (Schroeder et al., 1986), yet is not well defined. The articles reviewed were the research articles that include audit quality as research variable, either as dependent or independent variables. The articles were purposefully selected to represent balance combination between audit specific and more general accounting journals and between Anglo Saxon and Anglo American journals. The articles were published between 1983-2011 and from the A/A class journal based on ERA 2010’s classifications. The study found that most of the articles reviewed used multiple regression analysis and treated audit quality as dependent variable and measured it by using a proxy. This study also highlights the size of data sample used and the lack of discussions about the assumptions of the statistical analysis used in most of the articles reviewed. This study concluded that the effectiveness and validity of multiple regressions do not only depends on its application by the researchers but also on how the researchers communicate their findings to the audience.KEYWORDSAudit quality, regression analysisABSTRAKKajian ini bertujuan untuk mereviu bagaimana analisa regresi digunakan dalam suatu fenomena abstrak seperti kualitas audit, suatu konsep yang penting dalam praktik audit (Schroeder et al., 1986) namun belum terdefinisi dengan jelas. Artikel yang direviu dalam kajian ini adalah artikel penelitian yang memasukkan kualitas audit sebagai variabel penelitian, baik sebagai variabel independen maupun dependen. Artikel-artikel tersebut dipilih dengan cara purposif sampling untuk mendapatkan keterwakilan yang seimbang antara artikel jurnal khusus audit dan akuntansi secara umum, serta mewakili jurnal Anglo Saxon dan Anglo American. Artikel yang direviu diterbitkan pada periode 1983-2011 oleh jurnal yang masuk dalam kategori A/A berdasarkan klasifikasi ERA pada tahun 2010. Kajian ini menemukan bahwa sebagian besar artikel-artikel tersebut menggunakan analisa regresi berganda dan menjadikan kualitas audit sebagai variabel dependen serta mengukurnya menggunakan proksi. Kajian ini juga menyoroti ukuran data sampel yang digunakan dan kurangnya pembahasan mengenai asumsi yang digunakan dalam analisa statistik. Kajian ini menyimpulkan bahwa efektivitas dan validitas penggunaan analisa regresi berganda dalam penelitian tidak hanya bergantung pada kemampuan peneliti untuk menggunakannya, namun juga pada kemampuan peneliti untuk mengkomunikasikan hasil penelitiannya kepada pembaca.KATA KUNCIKualitas audit, analisa regresi

scholarly journals Geometrical Characterization of Yucatan Churches

2019 ◽  
Author(s):  
Isis Perez ◽  
Graça Vasconcelos ◽  
Paulo B. Lourenço
Keyword(s):  
Regression Analysis ◽  
Statistical Analysis ◽  
The South ◽  
Geometrical Characterization ◽  
Geometrical Features ◽  
Statistical Studies ◽  
Two Phases ◽  
Definition Of

<p>This paper presents the methodology used in the geometrical characterization of Yucatan churches. The main aim was to determine the geometrical features of the typical profile that represent with the best accuracy the churches with canon vaults built in the south of Mexico. The methodology was structure in two phases: (1) preliminary studies and definition of the database of the Yucatan churches and (2) statistical studies on the database. After the definition of the key parameters describing the typical profile of one nave Yucatan churches, a statistical analysis was carried out through regression analysis among the different parameters and definition of histograms for the variables. An attempt to describe the key parameters as a function of the span of the churches was also performed. Based on the results obtained, it seems that the Yucatan’s churches were built totally in an intuitive way as they do not present clear numerical relationships between geometrical key parameters.</p>

scholarly journals Hubungan Antara Self-Efficacy Akademik dan Konsep Diri Akademik dengan Prestasi Akademik

Humaniora ◽  
2013 ◽  
Vol 4 (2) ◽  
pp. 1125
Author(s):  
Lisa Ratriana Chairiyati
Keyword(s):  
Academic Achievement ◽  
Regression Analysis ◽  
Statistical Analysis ◽  
Self Efficacy ◽  
Computer Method ◽  
Self Concept ◽  
Independent Variables ◽  
The Relationship ◽  
Academic Self Efficacy ◽  
Two Independent Variables

This study discusses the relationship between academic self-efficacy and academic self-concept with academic achievement. The design of the study was descriptive - correlational, with a study sample of 192 children. Statistical Analysis with SPSS computer method (Statistical Package for Social Science) version 17.0 for windows is used to find out characteristics of the respondents, and the regression analysis between the two independent variables (self-efficacy and academic self-concept academic) and the dependent variable (academic achievement) produce models regression . The results showed only variable Self-Efficacy (SE) contributes positively to academic achievement. It is supported by the value of t-statistic greater than 1, 645 for the value . Hence it can be said that the dependent variable (academic achievement) can be predicted with self-efficacy academic. 

The Effects of Exercise Commitment Facilitated by Service Quality of Smartphone Exercise Applications on Continued Exercise Intention

2019 ◽  
Vol 118 (1) ◽  
pp. 14-19
Author(s):  
Boo-Gil Seok ◽  
Hyun-Suk Park
Keyword(s):  
College Students ◽  
Factor Analysis ◽  
Regression Analysis ◽  
Statistical Analysis ◽  
Correlation Analysis ◽  
Service Quality ◽  
Frequency Analysis ◽  
Primary Data ◽  
Exercise Intention

Background/Objectives: The purpose of this study is to examine the effects of exercise commitment facilitated by service quality of smartphone exercise Apps on continued exercise intention and provide primary data for developing and/or improving smartphone exercise Apps. Methods/Statistical analysis: A questionnaire survey was conducted amongst college students who have experiences in using exercise App(s) and regularly exercise. The questionnaire is composed of four parts asking about service quality, exercise commitment, continued exercise intention, which were measured with a 5-point Likert Scale, and demographics. Frequency analysis, factor analysis, correlation analysis, and regression analysis were carried out to analyze the obtained data with PASW 18.0.

PENGARUH PELATIHAN DAN MOTIVASI KERJA TERHADAP KINERJA KARYAWAN PT. BAKRIE PIPE INDUSTRIES BEKASI

2016 ◽  
Vol 4 (2) ◽  
Author(s):  
Imam Wibowo, M.Si ◽  
Rusma Patriansyah
Keyword(s):  
Statistical Analysis ◽  
Employee Performance ◽  
Positive Influence ◽  
Independent Variables ◽  
Operating Division ◽  
Independent Variable

The purpose of this research is to know the information about relationship between independent variables which are training (X1) and motivation (X2) with dependent variable which is employee performance (Y) of PT. Bakrie Pipe Industries Bekasi, both simultaneously and partially. Data collected from 78 employee of PT. Bakrie Pipe Industries Operating Division randomly using Slovin formula. Then all data was analyzed by using regression and statistical analysis using F-statistic to know the influence of independent variable simultaneously and t-statistic to know the influence of independent variable partially with using SPSS Ver. 22 software. The results of this research shown that: 1). Simultaneously, training and motivation have positive influence and significant to employee performance of PT. Bakrie Pipe Industries Bekasi. 2). Partially, training has positive influence and significant to employee performance of PT. Bakrie Pipe Industries Bekasi. 3). Partially, motivation has positive influence and significant to employee performance of PT. Bakrie Pipe Industries Bekasi.

scholarly journals Development and Validation of a Faith Scale for Young Children

Religions ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 197
Author(s):  
Sungwon Kim
Keyword(s):  
Factor Analysis ◽  
Early Childhood ◽  
Statistical Analysis ◽  
Pilot Study ◽  
Young Children ◽  
Christian Education ◽  
Faith Development ◽  
Education Programs ◽  
Confirmatory Factor ◽  
Development And Validation

The purpose of this study is to develop and validate a faith scale for young children. Data were collected from 424 young children, who had not yet entered elementary school, with their parents rating their faith level. Sixty-five preliminary questions were formulated under three domains―knowing, loving, and living—that were based on existing studies related to faith. The questions were reduced to 40 through a content validity test conducted by a seven-member panel. These questions were subsequently refined through pilot study, main survey, and statistical analysis. After exploratory and confirmatory factor analysis, the scale was finalized, comprising 25 questions that can be categorized into three factors: confessional faith life, missional life, and distinctive life. This scale is expected to measure early childhood faith and prove the effectiveness of Christian education programs on a young child’s faith development.

Statistical analysis plan of the head position in acute ischemic stroke trial pilot (HEADPOST pilot)

2016 ◽  
Vol 12 (2) ◽  
pp. 211-215
Author(s):  
Verónica V Olavarría ◽  
Hisatomi Arima ◽  
Craig S Anderson ◽  
Alejandro Brunser ◽  
Paula Muñoz-Venturelli ◽  
...  
Keyword(s):  
Ischemic Stroke ◽  
Statistical Analysis ◽  
Pilot Study ◽  
Acute Ischemic Stroke ◽  
Transcranial Doppler ◽  
Controlled Trial ◽  
Statistical Analysis Plan ◽  
Head Position ◽  
Process Of Care ◽  
Anterior Circulation

Background The HEADPOST Pilot is a proof-of-concept, open, prospective, multicenter, international, cluster randomized, phase IIb controlled trial, with masked outcome assessment. The trial will test if lying flat head position initiated in patients within 12 h of onset of acute ischemic stroke involving the anterior circulation increases cerebral blood flow in the middle cerebral arteries, as measured by transcranial Doppler. The study will also assess the safety and feasibility of patients lying flat for ≥24 h. The trial was conducted in centers in three countries, with ability to perform early transcranial Doppler. A feature of this trial was that patients were randomized to a certain position according to the month of admission to hospital. Objective To outline in detail the predetermined statistical analysis plan for HEADPOST Pilot study. Methods All data collected by participating researchers will be reviewed and formally assessed. Information pertaining to the baseline characteristics of patients, their process of care, and the delivery of treatments will be classified, and for each item, appropriate descriptive statistical analyses are planned with comparisons made between randomized groups. For the outcomes, statistical comparisons to be made between groups are planned and described. Results This statistical analysis plan was developed for the analysis of the results of the HEADPOST Pilot study to be transparent, available, verifiable, and predetermined before data lock. Conclusions We have developed a statistical analysis plan for the HEADPOST Pilot study which is to be followed to avoid analysis bias arising from prior knowledge of the study findings. Trial registration The study is registered under HEADPOST-Pilot, ClinicalTrials.gov Identifier NCT01706094.

Correlation between FA and ADC, number and length of the periprostatic neurovascular fibers

2021 ◽  
pp. 039156032110637
Author(s):  
Valerio Di Paola ◽  
Angelo Totaro ◽  
Giacomo Avesani ◽  
Benedetta Gui ◽  
Andrea Boni ◽  
...  
Keyword(s):  
Regression Analysis ◽  
Linear Regression ◽  
Negative Correlation ◽  
Multivariate Regression ◽  
Linear Regression Analysis ◽  
Multivariate Linear Regression ◽  
Multivariate Linear Regression Analysis ◽  
Independent Variables ◽  
Fiber Tracts ◽  
Good Agreement

Purpose: Our aim was to explore the relation between FA and ADC, number and length of the periprostatic neurovascular fibers (PNF) by means of 1.5 T Diffusion Tensor Imaging (DTI) imaging through a multivariate linear regression analysis model. Methods: For this retrospective study, 56 patients (mean age 63.5 years), who underwent 1.5-T prostate MRI, including DTI, were enrolled between October 2014 and December 2018. Multivariate regression analysis was performed to evaluate the statistically significant correlation between FA values (dependent variable) and ADC, the number and the length of PNF (independent variables), if p-value <0.05. A value of 0.5 indicated poor agreement; 0.5–0.75, moderate agreement; 0.75–0.9, good agreement; 0.61–0.80, good agreement; and 0.9–1.00, excellent agreement. Results: The overall fit of the multivariate regression model was excellent, with R2 value of 0.9445 ( R2 adjusted 0.9412; p < 0.0001). Multivariate linear regression analysis showed a statistically significant correlation ( p < 0.05) for all the three independent variables. The r partial value was −0.9612 for ADC values ( p < 0.0001), suggesting a strong negative correlation, 0.4317 for the number of fiber tracts ( p < 0.001), suggesting a moderate positive correlation, and −0.306 for the length of the fiber tracts ( p < 0.05), suggesting a weak negative correlation. Conclusions: Our multivariate linear regression model has demonstrated a statistically significant correlation between FA values of PNF with other DTI parameters, in particular with ADC.

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