simin ronagi; ali delavar; mohamadali mazaheri
Volume 3, Issue 11 , April 2013, , Pages 77-99
Abstract
Abstract
Background: Considering the importance of studying the factors affecting organ transplantation in Iran, the present research aims at examining the factor structure, reliability and validity of the organ transplantation attitude scale.
Method: The method of research was descriptive survey. ...
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Abstract
Background: Considering the importance of studying the factors affecting organ transplantation in Iran, the present research aims at examining the factor structure, reliability and validity of the organ transplantation attitude scale.
Method: The method of research was descriptive survey. A sample of 210 students, who were selected using multistage cluster sampling, completed the questionnaire. The validity of the questionnaire was assessed using content validity, construct validity and factorial validity. The reliability of the questionnaire was examined through Cronbach's alpha coefficient.
Findings: The pattern of correlation coefficients between the subscales indicated a good construct validity of the scale. The results of exploratory-confirmatory factor analysis were also indicative of good and acceptable fit of items. Moreover, the Cronbach's alpha coefficients for all subscales and total scale were desirable regarding psychometric properties, and reliability coefficient was also good.
Conclusion: Considering the results of the study, the scale constructed in the Iranian society can be said to have good validity and reliability. It can be used to assess the factors influencing organ transplantation in Iran.
masoud gerami pour; mohamad reza falsafi nejhad; ali delavar; nour ali farrokhi
Volume 3, Issue 9 , October 2012, , Pages 105-122
Abstract
Although numerous methods have been proposed for detecting biased items, but a few researches have empirically investigated the power and efficiency of these methods. The main goai of this research was to apply IRT-based likelihood ratio test and confirmatory factor analysis in detecting differential ...
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Although numerous methods have been proposed for detecting biased items, but a few researches have empirically investigated the power and efficiency of these methods. The main goai of this research was to apply IRT-based likelihood ratio test and confirmatory factor analysis in detecting differential item functioning (DIF) in high stakes tests. Monte Carlo simulated methods were used to answer the research questions. Required data were simulated through WINGEN2 in the form of 100 tests with 30 items that were fitted to 2PL model. Distributions of item difficulties and discrimination powers of all the tests were normal. Responses of 1000 examinees were also simulated with normal ability distribution for each test. Estimation methods of marginal maximum likelihood and weighted least squares were used to detect type and magnitudes of DIF. Data analysis in consecutive replications showed that IRT based methods were superior to CFA methods in detecting DIF. This superiority was observed in ail DIF conditions (low, moderate and high). After all. differences between two methods were small at 1000 sample sizes. No differences were observed between two methods in detecting different types of DIF. Results of this study confirm the results of Meade and Lautenschlager (2004; 2006), but is in contrast with the results of Flowers et al (2002). Finally, Likelihood Ratio test is recommended if there is any limitation in applying methods of detecting DIF.
ali delavar; masoud baratian; hosey bajami; masumeh masudian
Volume 2, Issue 8 , July 2012, , Pages 1-38
Abstract
The purpose of this paper is to standardize and normalize the health concerns questionnaire-54 (HCQ-54) to assess the health concerns of Iranian undergraduates at the state-run universities in Tehran, including University of Tehran, Tarbiat Mo'allem University, Allameh Tabataba'i University, Shahid Beheshti ...
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The purpose of this paper is to standardize and normalize the health concerns questionnaire-54 (HCQ-54) to assess the health concerns of Iranian undergraduates at the state-run universities in Tehran, including University of Tehran, Tarbiat Mo'allem University, Allameh Tabataba'i University, Shahid Beheshti University, Sharif University of Technology and Amir Kabir University of Technology. To this aim, 2000 undergraduates were selected using the random multi-stage sampling method. The general reliability of the scale and its subscales was computed through internal consistency. The results indicated excellent internal consistency (general Cronbach's alpha coefficient = 0.803, somatic concerns = 0.894, mental concerns = 0.939, social concerns = 0.646) and proved statistically satisfactory. Moreover, the construct validity of the scale was investigated through factor analysis of principal components with varimax rotation, after which a factor emerged that accounted for 28.843% of the total variance of the scale. The cutoff point of the study was 62 with sensitivity and specificity standing at 80% and 72%, respectively. The independent t-test showed no significant difference between male and female students on the HCQ-54 subscales.
parisa Dehkordian; ali delavar; hamidreza jali
Volume 2, Issue 6 , January 2012, , Pages 1-24
Abstract
Backgrounds: Recent studies showed that beside the person with addiction great number of person are with personality in the risk of addiction, but the measurement of this characteristic in Iran needs to instrument that similar to culture of this country.
Objectives: The purpose of this study was ...
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Backgrounds: Recent studies showed that beside the person with addiction great number of person are with personality in the risk of addiction, but the measurement of this characteristic in Iran needs to instrument that similar to culture of this country.
Objectives: The purpose of this study was the Preparing and normalization of addiction potential scale among students of Tehran universities.
Methods: after design, scale indicating 60 item were administrated to a sample of 90 addict and 540 students of Tehran universities.
Result: this scale distinguished between addict and non addict students. The reliability coefficients was estimated through internal consistency using cronbach alpha coefficient and was (α=0.88) . The validity of this scale investigated in two different ways: construct validity and face validity. The result obtained from analysis showed this scale consists of ten factors and is highly valided. T score was calculated for normalization.
Conclusion: overall indicated that the use of the addiction potential scale in researches, therapy and screening is useful.
ali dellavar; raed parvaz; f Dortaj
Volume 2, Issue 5 , October 2011, , Pages 1-29
Abstract
Background: Different ways to express anger and its consequences is allocated to a special place in fundamental and applied psychological research. Constructing and validating a useful scale to measure anger is also another important point. Objective: The aim of this research ...
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Background: Different ways to express anger and its consequences is allocated to a special place in fundamental and applied psychological research. Constructing and validating a useful scale to measure anger is also another important point. Objective: The aim of this research was to make and to find norms of multidimensional anger scale (anger arousal, hostile outlook, external and internal angers and anger-eliciting situations) among high school students. Method: The theoretical principles of the previous studies were studied first. Then, the researchers designed a questionnaire based on the framework resulted from studying the achieved resources. After studying the form and content of the raised questions in relation to each of the sub-tests and removing the inappropriate ones, 29 questions were performed for the final performance on a group composed of 400 students (212 males and 188 females) who were slected by the relative classification and random testing method. Results: The result of factor analysis by cycle method of Varimex of five factors equaling to 0/88, variance expression paralleling to theoretical principles of the structure were indicated .The sustainability of the questionnaire through Kranbuch alfa 0/87 and testing method-retest 0/81 and correlational results between the first and second performances in the five factors are 0/79 (Anger arousal), 0/81(Anger out), 0/77 (Hostile outlook) 0/86(Anger In), 0/83 (Anger-Eliciting Situation) respectively. The division method was used to get sure of the sustainability for the two halves 0/85 and 0/82 respectively. The total sustainability of the assumed test was 0/77. After analyzing the data, finding the norms, cut point and interference rate were calculated. The cut point for this test, in proportion with the average and standard deviation was 88/01. According to this cut point, the percent of interference rate 7/2 in the whole sample was 3/8 for the male and 11/2 for the female. Conclusion: it can be suggested the multidimensional anger scale is a valid instrument to measure students' anger.
farzaneh Roaei; ali delavar; noreali farokhi
Volume 1, Issue 4 , July 2011, , Pages 1-25
Abstract
The current paper reviews the concept of meta analysis of Anxiety & Depression researches in 1363-1385 at University of Allameh Tabatabaei university , faculty of psychology and education science . The relevant controls were convenient for the present research in order to study the aspect of ...
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The current paper reviews the concept of meta analysis of Anxiety & Depression researches in 1363-1385 at University of Allameh Tabatabaei university , faculty of psychology and education science . The relevant controls were convenient for the present research in order to study the aspect of Anxiety & Depression, therefore a number of 41 cases from 55 on anxiety including 36 case out of 59 on depression were optimized for meta analysis . Research methodology is structured due to revision in connection with descriptive statistics device ,meanwhile it is meta analysis in terms of inferential statistics , therefore software of CMA (Comprehensive Meta Analysis ) & SPSS used to analyze collected data . The whole Research analyzed in connection with significant of case reliability. Statistical method t (dependent & independent) is significant in scope of cause of effect in anxiety and way of anxiety therapy methods including cause and effect on depression for depression therapy methods .The sampling is cluster form , while sampling method for accessibility in Research linked to causes and anxiety factors , though the anxiety therapy method and accessible sampling method plus random sampling method are in significant range. The methods of randomly and cluster samplings in the field of cause and effect are depression components furthermore randomly sampling method in depression therapy method are significant too. The Research methodology used in cause , comparative and correlation area over cause and effect of anxiety ,while anxiety therapy methods ,the case of experimental & semi experimental methods are in significant range too. The results arisen by this paper demonstrate that Research carried out in the fields of anxiety and depression deserve more revision and modification because novel Researches are critical for application specifically in both fields concerned.
Azadeh Bolooki; ali delavar; Esmail Mam sharifi
Volume 1, Issue 3 , April 2011, , Pages 1-33
Abstract
he present research aims to investigate the role of motivational and attitudinal components on math achievement and compile a structured model for first year high school students in Urumiyeh city. The sample group comprised 300 first year high school students in Orumiyeh city. In order to gather ...
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he present research aims to investigate the role of motivational and attitudinal components on math achievement and compile a structured model for first year high school students in Urumiyeh city. The sample group comprised 300 first year high school students in Orumiyeh city. In order to gather data and determine the level of participants' math achievement, their math scores of the first semester was used. In analyzing data, method of analysis route, using LISREL software, the effects of direct and indirect effects and general self-concept variables, father' education level of mathematics, interest in mathematics, parental support and gender stereotyping were discussed. The results showed that the role of self-concept variables, father' education level, parental support and the importance of mathematical on math achievement was meaningful. Further, the self-concept variables and the education of his father's direct progress with mathematical lesson was significant.The other results in this research for index fit and proper research with data was considerable.
Moustafa Nickname; Ali Taghipour Zahir; ali delavar; Mohammad Ghafary Mojalaj
Volume 1, Issue 3 , April 2011, , Pages 1-20
Abstract
he aim of this study is to study the of validity and reliability of the Questionnaire Assessing Organizational Innovation. The sample was a totall of 308 managers from educational administers in Tehran City. The results of this study showed that opportune reliability and validity for Questionnaire Assessing ...
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he aim of this study is to study the of validity and reliability of the Questionnaire Assessing Organizational Innovation. The sample was a totall of 308 managers from educational administers in Tehran City. The results of this study showed that opportune reliability and validity for Questionnaire Assessing Organizational Innovation. The internal consistency coefficient (Chronbach, s alpha) for Questionnaire Assessing Organizational Innovation obtained 0.83. This was relatively high level of Chronbach. S alpha showed relatively high level of reliability. Correlation results among Questionnaire Assessing Organizational Innovation subscales showed convergence at measurement of single phenomenon. The positive correlation of the Questionnaire Assessing Organizational Innovation showed opportune convergent validity.
jalil younesi; ali delavar; mohammad reza falsafi nejhad
Volume 1, Issue 2 , January 2011, , Pages 139-169
Abstract
This study aims to investigate the psychometric characteristics of specialized items of distance education psychology examinations held by Payame Noor University in 2006. To do this, 2000-subject sample was randomly selected from among all those sitting for the distance education psychology exam. Then, ...
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This study aims to investigate the psychometric characteristics of specialized items of distance education psychology examinations held by Payame Noor University in 2006. To do this, 2000-subject sample was randomly selected from among all those sitting for the distance education psychology exam. Then, the sample group was randomly divided into two 1000-subject groups; one of which was used for parameter estimation, and the other for testing model-data fit. In order to analyze the test and its items based on the classical test theory (CTT), in addition to calculating frequency distribution of distracters, items variance, difficulty index, discrimination index and reliability coefficient of the test were computed. In order to analyze the test and its items based on the item- response theory (IRT), assumptions of unidimensionality and local independence were first examined. In this piece of research, in order to determine unidimensionality, all specialized psychology exams were studied in terms of factor analysis by TESTFACT Program. Results of the analyses of the above exams suggested that all of them are unidimensional, and therefore local independence assumptions are verified. Model-data fit was explored by means of BILOG-MG software, and finally, items' parameters (difficulty, discrimination and guessing) estimated along with subjects' ability parameters were extracted. Distracters' analysis showed that all items' distracters were not homogeneous in terms of probability and have had poor performance. It also indicated that in psychology and sociology exams, two-parameter model, and in philosophy exam, three- parameter model were best fit for test items. At the same time, despite the fact that mean of all exams was lower than the criterion score, it seems that the difficulties in the subject of philosophy have been more and this exam had more impact on the subjects' academic failure.
ali mohammad rezaee; ali delavar; hassan ahadi; fariborz dortaj
Volume 1, Issue 1 , October 2010, , Pages 1-25
Abstract
The present research aims to construct Iran Students' Evaluation of Educational Quality of faculty and has been administered to measure it’s validity and reliability. 962 students were chosen from Tehran governmental universities in different humanities course of studies to complete the questionnaire. ...
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The present research aims to construct Iran Students' Evaluation of Educational Quality of faculty and has been administered to measure it’s validity and reliability. 962 students were chosen from Tehran governmental universities in different humanities course of studies to complete the questionnaire. The factor analysis was used to study the questionnaire validity and accordingly ten factors were extracted. Regarding the research theoretical basis and the questions contents the fallowing factors has been distinguished: Scientific ability, interest and dynamic, motivation reinforcement and the students abilities, student and faculty human interaction quality in classroom, student and faculty human interaction quality out of classroom, evaluation and feedback, organization, ethical issues observance, educational regulation and order observance and satisfaction from faculty. The questionnaire reliability was assessed by internal consistency using Cronbach coefficient. Based on the obtained results, the coefficient of the ten factors (except to ethical issues observance which is %61) were satisfactory.The smallest Cronbach coefficient after ethical issues observance belongs to educational regulation and order observance which is %69 with three questions and the biggest Cronbach coefficient belongs to scientific ability which is %91 with 18 questions. The questionnaire total reliability coefficient is %97 which is outstanding. Based on the results of this research, the Iran Students' Evaluation of Educational Quality is qualified to be used for evaluation of faculty educational quality by students
