scholarly journals Exposure to BTEX and Assessment of the Potential Risk among Pregnant Residents Living in the Vicinity of a Petro-chemical Industrial Estate

2014 ◽  
pp. 25-35
Author(s):  
Santi Keadthongthawee ◽  
Nipa Maharachpong ◽  
Sirirat Chanvaivit ◽  
Nalinee Sripaung ◽  
Nantaporn Phatrabuddha
Keyword(s):  
Linear Regression ◽  
Pregnant Women ◽  
Multiple Linear Regression ◽  
Potential Risk ◽  
Hippuric Acid ◽  
Ambient Air ◽  
Reference Level ◽  
Industrial Estate ◽  
Significant Difference ◽  
The Relationship

This research was conducted to estimate exposure and risk of exposure to BTEX (benzene, toluene, ethylbenzene and xylene)by a cross-sectional studying among pregnant women who lived in the vicinity of a petro-chemical industrial estatearea. Personal exposure was monitored by environmental and biological sampling.Other relevant data were gathered by a structured questionnaire for analysis. The relationship between BTEX exposure and potential risk factors was determined by multiple linear regression. Average BTEX exposure levels were 18.89, 29.40, 10.26, and 17.85μg m-3, respectively, which were significantlyhigher than the control group. Urinary metabolite levels of muconic acid(t,t-MA), hippuric acid (HA),mandelic acid (MA), andmethyl-hippuric acid (mHA)were significantly higher in pregnant residents living in the vicinity of the petro-chemical industrial estate area.The correlation between women’s individual exposure to BTEX and theirurinary metabolites showed significantlydifference between groups.Risks of benzene and ethylbenzene exposure for these pregnant subjects were approximately 4.37x10-7 and 1.92x10-8lower than the acceptable limits of United States Environmental Protection Agency(US.EPA.) guidelines(10-6). The hazard index (HI) of these pregnant subjects a lifetime rate was 0.555 which was below the reference level(HI < 1).Multiple linear regression analysis found that t,t-MA, HA, MA, and mHAin the urine of all models were significantly (p<0.05)and positively related with BTEX in ambient air.The study showed that there was a low cancer risk for pregnant women in the petro-chemical industrial estatezone. However, when compared with the control area, a statistically significant difference was found in the relationship between BTEX content in ambient air and metabolites in the urine of pregnantwomen. The implication is that the responsible government agencies should implement health surveillancecontinuously.

scholarly journals Association between Physical Literacy and Physical Activity: A Multilevel Analysis Study among Chinese Undergraduates

2020 ◽  
Vol 17 (21) ◽  
pp. 7874
Author(s):  
Rui-Si Ma ◽  
Raymond Kim-Wai Sum ◽  
Ming-Hui Li ◽  
Yan Huang ◽  
Xue-Liang Niu
Keyword(s):  
Physical Activity ◽  
Linear Regression ◽  
Multiple Linear Regression ◽  
Economic Status ◽  
Physical Literacy ◽  
Physical Competence ◽  
Grade Point ◽  
Significant Difference ◽  
The Relationship ◽  
Chinese Undergraduates

Aim: To examine the association between the perceived physical literacy (PL) and physical activity (PA) levels among Chinese undergraduates. Methods: Simplified Chinese version of the Perceived Physical Literacy Instrument and the International Physical Activity Questionnaire were used to measure 536 students’ perceived PL and PA levels. Pearson’s product-moment correlation and multiple linear regression were then used to examine the relationship between the perceived PL and PA levels. Additionally, standard regression analysis was conducted to test for the effects at different demographics. Results: The correlation between perceived PL and PA level was low but significant (r = 0.350, p < 0.01). The multiple linear regression equation was significant (F = 25.228, p < 0.01, ΔR2 = 0.120). Metabolic equivalent values were used to predict PA levels of participants, which were −3818.582 + 272.535 (motivation) + 249.848 (confidence and physical competence) + 149.899 (interaction with the environment). The association of factors such as socio-economic status (SES) (p = 0.092) and grade point average (GPA) (r = 0.119, p = 0.022) were examined using Pearson’s product-moment correlation. Gender (p < 0.01) and body mass index (BMI) (p < 0.01) were also explored for their differences. Conclusions: Perceived PL and PA levels were significantly related. The association between PL and GPA was identical. GPA and BMI showed significant difference between each group. The study offers a path to explore the concept of PL and how it can affect the PA of Chinese undergraduates. Furthermore, on the basis of this study, more research could develop practical interventions for Chinese undergraduates to enhance their PL and engagement in a lifetime of PA.

PENGARUH HARGA DAN BRAND TRUST TERHADAP KEPUTUSAN PEMBELIAN OPPO SMARTPHONE (Studi kasus pada OPPO Store, Sinergy Celular Medan)

2019 ◽  
Vol 14 (1) ◽  
pp. 17
Author(s):  
Andi S Tarigan ◽  
Zulkarnaian Siregar
Keyword(s):  
Data Analysis ◽  
Linear Regression ◽  
Multiple Linear Regression ◽  
Coefficient Of Determination ◽  
Purchase Decision ◽  
Brand Trust ◽  
Significance Level ◽  
Research Hypothesis ◽  
Analysis Technique ◽  
The Relationship

AbstrakPenelitian ini bertujuan untuk mengetahui Pengaruh Harga dan Brand Trust Terhadap Keputusan Pembelian pada Sinergy Celular Medan.Sampel dalam penelitian ini adalah seluruh pengunjung Sinergy Celular Medan sebanyak 77 orang.Teknik pengumpulan data yang digunakan adalah melalui kuesioner (angket) yaitu dengan cara menyebarkan kuesioner kepada sampel (responden) dan mengumpulkannya kembali. Teknik analisis data yang digunakan adalah Regresi Linear Berganda.Sebelum data diregresikan maka terlebih dahulu di uji keterkaitannya antara variabel, datanya diuji menggunakan uji normalitas data, multikolinearitas, dan heterokedastisitas.Serta untuk mengetahui kontribusi faktor Harga dan Brand TrustTerhadap Keputusan Pembelian digunakan rumus Koefisien Determinasi (R2). Hipotesis penelitian diterima apabila t hitung >  t tabel dengan tingkat signifikansi 0,1. Nilai t tabel dalam penelitian ini 1,993. Nilai t hitung variabel X1 sebesar 2,107 t hitung lebih besar dari t tabel maka hipotesis di terima, nilai t hitung variabel X2   sebesar 3,405 t hitung lebih besar dari t tabel maka hipotesis di terima. Kata kunci: Harga, Brand Trust, Keputusan Pembelian AbstractThis study aims to determine the Influence of Price and Brand Trust on Purchasing Decision at Sinergy Celular Medan. The sample in this study is all visitors Sinergy Celular Medan as many as 77 people.Data collection technique used is through questionnaire (questionnaire) that is by distributing questionnaires to the sample (respondent) and collect it back. Data analysis technique used is Multiple Linear Regression. Before the data is diregresikan then first in the test the relationship between variables, the data tested using the test of data normality, multicollinearity, and heterokedastisitas. And to know the contribution of price factors and Brand Trust Against Purchase Decision is used the formula Coefficient of Determination (R2). Research hypothesis accepted if t arithmetic> t table with significance level 0,1. The value of t table in this study is 1,993. Value t arithmetic variable X1 of 2.107 t arithmetic greater than t table then the hypothesis received, the value of t arithmetic variable X2 of 3.405 t arithmetic greater than t table then the hypothesis received. Keywords: Price, Brand Trust, Purchase Decision

scholarly journals Study on process of chemical fiber filament automatic doffing system based on simulation platform and machine learning

2021 ◽  
Vol 16 ◽  
pp. 155892502110548
Author(s):  
Hongxin Zhu ◽  
Kun Zou ◽  
Wenlan Bao
Keyword(s):  
Neural Network ◽  
Linear Regression ◽  
Multiple Linear Regression ◽  
Production Line ◽  
Simulation Platform ◽  
Chemical Fiber ◽  
Production Lines ◽  
The Neural Network ◽  
Spss Software ◽  
The Relationship

In recent years, a large number of automatic equipment has been introduced into the chemical fiber filament doffing production line, but the related research on the fully automatic production line technology is not yet mature. At present, it is difficult to collect data due to test costs and confidentiality. This paper proposes to develop a simulation platform for a chemical fiber filament doffing production line, which enables us to effectively obtain data and quantitatively study the relationship between the number of manual interventions and other process parameters of the production line. Considering that the parameter research is a multi-factor problem, an orthogonal test was designed by using SPSS software and was carried out by using a simulation platform. The multiple linear regression (MLR) and the neural network optimized by genetic algorithm were adopted to fit the relationship between the number of manual interventions and other parameters of the production line. The SPSS software was applied to obtain the standardized coefficients of the multiple linear regression fitting and the neural network mean impact value (MIV) algorithm was applied to obtain the magnitude and direction of the impact of different parameters on the number of manual interventions. The above results provide important reference for the design of similar new production lines and for the improvement of old production lines.

scholarly journals THE EFFECT OF RELATIONSHIP MARKETING ON THE LOYALTY OF SUPPLIER OF TOBACCO WITH MANUAL DRYING IN PT. EXPORT LEAF INDONESIA

2016 ◽  
Vol 5 (2) ◽  
Author(s):  
Saparwadi Saparwadi
Keyword(s):  
Linear Regression ◽  
Multiple Linear Regression ◽  
Relationship Marketing ◽  
Economic Benefit ◽  
Significance Test ◽  
Three Dimensions ◽  
Reliability Test ◽  
Dominant Effect ◽  
Complaint Handling ◽  
The Relationship

This  research  is  aimed at  analyzing  the  effect  of  relationship  marketing  on  the commitment of company, communication of company and the complaint handling of PT. ELI on the loyalty of supplier of tobacco with manual drying in East Lombok. The  data  were  collected  through  questionnaire  and  verified  with validation  and reliability test. The data then were analyzed using classic assumption, multiple linear regression, significance test, and certain use of parameter to proof the hypothesis. The research showed that there is partially and simultaneously significant effect of relationship     marketing     consisting     of     company     commitment,     company communication,  and complaint  handling of  PT  ELI on the  loyalty of  supplier of tobacco with manual drying in east Lombok. Of the relationship marketing of PT ELI that  has  a  dominant effect  of  the  loyalty  of  supplier  in  East  Lombok  is  the commitment of company. The level of effect of commitment of company is 24.10 percent (the value of r2X1Y) on the loyalty of supplier. The simultaneous effect of the three dimensions of relationship marketing is 50.40 percents (R2   =0.504) on the loyalty of supplier, categorized as the high criteria. One of the suggestions for the management of PT ELI is to improve partnership with the supplier, with the concept that may be applied as well as possible in order that the partnership can give sustainable and high economic benefit for the farmers. Keywords:  relationship, marketing  (Company, commitment, communication,  and complain handling) and loyalty of Supplier

scholarly journals KNOWLEDGE AS THE INTERVENING VARIABLE ON RELIGIOSITY VALUE OF ACCOUNTANT STUDENTS' SAVING INTEREST FOR ISLAMIC BANKING

2021 ◽  
Vol 1 (2) ◽  
pp. 63-68
Author(s):  
Wahyuning Murniati ◽  
Evita Purnaningrum
Keyword(s):  
Linear Regression ◽  
Path Analysis ◽  
Hypothesis Testing ◽  
Multiple Linear Regression ◽  
Positive Relationship ◽  
Islamic Banking ◽  
Economic Activities ◽  
Analytical Technique ◽  
The Relationship

The development of Islamic economics in banking practices in society develops innovatively. Various sharia banking products have become the people's choice in supporting their daily economic activities. The same thing also happened to students. The purpose of study is to analyze the religiosity effect of students' interest in saving for Islamic banking with knowledge as intervening variable. Multiple linear regression is an analytical technique used here, with hypothesis testing and path analysis to support its conclusions. The result of this study is that the level of religiosity significantly effects on students' interest in saving for Islamic banking with positive relationship. Likewise, knowledge is able mediate the relationship between the religiosity variable and students' interest in saving.

scholarly journals PENGARUH KOMPETENSI DAN DISIPLIN KERJA TERHADAP KEPUASAN PELANGGAN DI KANTOR PELAYANAN KEKAYAAN NEGARA DAN LELANG (KPKNL) PALU

2020 ◽  
Vol 4 (2) ◽  
pp. 103-112
Author(s):  
Sri Dwi Ratih Wijayanti ◽  
Lina Mahardiana ◽  
Risnawati Risnawati
Keyword(s):  
Data Analysis ◽  
Linear Regression ◽  
Customer Satisfaction ◽  
Multiple Linear Regression ◽  
Quantitative Research ◽  
Test Results ◽  
Significance Level ◽  
Analysis Techniques ◽  
Regression Test ◽  
The Relationship

This study aims to: know and analyze whether the Competence and Discipline Work simultaneously and partially effect on Customer Satisfaction in the Office of State Assets and Auction (KPKNL) Palu. This study uses quantitative research which is a study that aims to explain the relationship between two or more variables with a sample of 49 customers and data analysis techniques used are multiple linear regression. The results of hypothesis analysis and testing can be concluded that: (1) based on regression test results obtained sig. F of 0.00 <0.05, which can be interpreted that the variable Competence and Work Discipline affect simultaneously to Customer Satisfaction. (2) based on regression test results obtained Competence variables have significance level t sig. 0.010 <α 0.05, which can be interpreted that the variable Competence partially significant effect on customer satisfaction. (3) based on the regression test results obtained variable Work Discipline has significance level t sig. 0,000 <α 0.05, which can be interpreted that the variable Work Discipline partially significant effect on Customer Satisfaction. Penelitian ini bertujuan untuk: mengetahui dan menganalisis apakah Kompetensidan Disiplin Kerjaberpengaruh secara serempak dan parsial terhadap Kepuasan Pelanggan di Kantor Pelayanan Kekayaan Negara dan Lelang (KPKNL) Palu. Penelitian ini menggunakan penelitian kuantitatif yang merupakan penelitian yang bertujuan untuk menjelaskan hubungan antara dua variabel atau lebih dengan sampel 49 pelanggan dan teknik analisis data yang digunakan adalah regresi linear berganda.Hasil analisis dan pengujian hipotesis dapat disimpulkan bahwa: (1) berdasarkan hasil uji regresi diperoleh sig. F sebesar 0,00 < 0,05, yang dapat diartikan bahwa variabel Kompetensidan Disiplin Kerjaberpengaruh secara serempak terhadap Kepuasan Pelanggan. (2) berdasarkan hasil uji regresi diperoleh variabel Kompetensimemiliki tingkat signifikasi t sig. 0,010 < α 0,05, yang dapat diartikan bahwa variabel Kompetensisecara parsial berpengaruh signifikan terhadap kepuasan pelanggan. (3) berdasarkan hasil uji regresi diperoleh variabel Disiplin Kerja memiliki tingkat signifikasi t sig. 0,000 < α 0,05, yang dapat diartikan bahwa variabel Disiplin Kerja secara parsial berpengaruh signifikan terhadap Kepuasan Pelanggan.

scholarly journals Mortalité du sapin baumier défolié par la tordeuse des bourgeons de l'épinette dans la région de la Gatineau au Québec

1982 ◽  
Vol 58 (5) ◽  
pp. 213-219 ◽  
Author(s):  
Jean Beaulieu ◽  
Yvan J. Hardy
Keyword(s):  
Linear Regression ◽  
Multiple Linear Regression ◽  
Least Squares ◽  
Random Number ◽  
Least Squares Method ◽  
Random Number Generator ◽  
Balsam Fir ◽  
Number Generator ◽  
Profit Analysis ◽  
Significant Difference

This paper presents a method of analysis which differentiates between spruce budworm caused mortality and regular mortality on balsam fir in the Gatineau region in Quebec. A first attempt was made using multiple linear regression and a uniform random number generator. In order to overcome the bias inherent to the least squares method when dealing with a binary (0,1) dependent variable, a profit analysis was also conducted. In this case, the parameters and their variance were estimated using likehood method. These two approaches proved to be equivalent when percent budworm caused mortality was compared within the 1958 to 1979 period covered by the data at hand, while the outbreak lasted from 1968 to 1975.In 1979, approximately 55% of the stems had been killed by the budworm, accounting for 53% of the volume. Maple-yellow birch associations were more affected than fir associations although no significant difference was found. Fir mortality was delayed by aerial spraying of insecticides but this advantage disappeared as soon as the spray operations came to an end.

Biomechanics and Blood Pressure with Modeling of Pulse Wave Velocity Based on Multiple Linear Regression

2014 ◽  
Vol 952 ◽  
pp. 261-264
Author(s):  
Long Jia
Keyword(s):  
Blood Pressure ◽  
Linear Regression ◽  
Pulse Wave Velocity ◽  
Regression Model ◽  
Multiple Linear Regression ◽  
Wave Velocity ◽  
Pulse Wave ◽  
Model Assessment ◽  
Practical Test ◽  
Significant Difference

The purpose of present study is to build a multiple linear regression model using biomechanical theory to assess the relationship of pulse wave velocity (PWV) with blood pressure, height and age. By testing the PWV, blood pressure, height, weight of 164 female adults aged above 45 and existing data, the author constructed a multiple linear regression equation. Through comparing the practical test PWV values with the estimate values from regression model, the result showed that there was no significant difference between the model assessment and practical test values (t=0.833, p=.423>.05). Therefore, the regression model is fit for assessing PWV value by height, age, systolic and diastolic pressure.

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