Publikasi Internasional

Indonesian Digital Natives: ICT Usage Pattern Study across Different Age Groups

Neila Ramdhani, Wisnu Wiradhany


Since its first appearance on early 2000’s at the U.S, the idea that a new generation of students called digital natives or net generation has entered the world has been widely discussed by parents and educators alike. It is said that this generation think, socialize, and act differently; and they will alter roles and regulation of work and educational institutes. Now, at the second decade of the 21st century, Indonesia has to ready herself to meet this new generation. In this paper, we compared information and technology (ICT) access, activities within ICT, investment on ICT, and attitude towards ICT between five hundred Indonesian in three different groups: those who born before the 1980s; those who born between 1980s to 1989’s, and those who born after the 1990s by ANOVA. We found that there were no difference on information and technology (ICT) access, activities, investment on ICT, and attitude towards ICT between the groups. read more

Estimating reliability coefficient for multidimensional measures: A pedagogical illustration

Wahyu Widhiarso*, Hamdollah Ravand**


The literature has shown that the assumption of unidimensional measurement in psychology is difficult to fulfill, since measurement in psychology is usually a complex process that aims at providing information about constructs. As a consequence, factor analysis for psychological measurement tends to conceal several factors that underlie the items on the scale. Since applying a reliability coefficient (e.g., Cronbach’s alpha) based on a unidimensional assumption for a multidimensional measure will underestimate reliability, researchers should use an appropriate coefficient that matches the characteristics of the measure. There are several, albeit not frequently utilized reliability coefficients for multidimensional measures. The present article demonstrates the application of the stratified alpha, Mosier’s, Raykov’s, McDonald’s, and Hancock-Mueller’s coefficients for estimating the reliability of multidimensional measures. read more

Examining Method Effect of Synonym and Antonym Test in Verbal Abilities Measure

Wahyu Widhiarso, Haryanta


Many researchers have assumed that different methods could be substituted to measure the same attributes in assessment. Various models have been developed to accommodate the amount of variance attributable to the methods but these models application in empirical research is rare. The present study applied one of those models to examine whether method effects were presents in synonym and antonym tests. Study participants were 3,469 applicants to graduate school. The instrument used was the Graduate Academic Potential Test (PAPS), which includes synonym and antonym questions to measure verbal abilities. Our analysis showed that measurement models that using correlated trait–correlated methods minus one, CT-C(M–1), that separated trait and method effect into distinct latent constructs yielded slightly better values for multiple goodness-of-fit indices than one factor model. However, either for the synonym or antonym items, the proportion of variance accounted for by the method is smaller than trait variance. The correlation between factor scores of both methods is high (r = 0.994). These findings confirm that synonym and antonym tests represent the same attribute so that both tests cannot be treated as two unique methods for measuring verbal ability. read more

Examining response aberrance as a cause of outliers in statistical analysis

Wahyu Widhiarsoa, Bambang Sumintono


This study examined to what extent participants who produce aberrant responses were in fact outliers in statistical analysis. Participants of this study were high school students (N = 2983) who filled out three personality questionnaires. Response aberrance for these instruments was detected using infit, outfit, and person-fit statistics under Rasch modeling, all of which reflect the degree to which response patterns conform to the model. According to the person-fit cutoff, participants were divided into three categories: overfit, fit, and underfit. Mahalanobis Distance (MD) was used to identify participants classified as outliers, based on a simple regression analysis. Analysis of variance highlighted significant differences between these three categories. The study found that underfit persons were more likely exhibited higher MD values than overfit or fit persons, meaning that they tended to perform as outliers. The correlation coefficients between two variables considerably increased after underfit persons were excluded in subsequent analyses. Another result showed that participants tended to consistently produce aberrant responses across the questionnaires, but that they did not consistently perform as outliers. read more

Exploring somatization types among patients in Indonesia: latent class analysis using the Adult Symptom Inventory

Wahyu Widhiarso, M. Noor Rochman Hadjam


The aim of this study was to explore somatization types by reducing patient complaints to their most basic and parsimonious characteristics. We hypothesized that there were latent groups representing distinct types of somatization.

Participants and procedure

Data were collected from patients undergoing both inpatient and outpatient treatment at two hospitals in Yogyakarta, Indonesia (N = 212).


Results from latent class analysis revealed four classes of somatization: two classes (Classes 1 and 2) referring to levels of somatization and two classes (Classes 3 and 4) referring to unique types of somatization. The first two classes (Classes 1 and 2; low and high levels of somatization, respectively) corresponded to the number of different symptoms that patients reported out of the list of physical symptoms in the Adult Symptom Inventory. The second two classes (Classes 3 and 4; non-serious and critical complaints, respectively) corresponded to two different sets of symptoms. Patients in Class 3 tended to report temporary mild complaints that are common in daily life, such as dizziness, nausea, and stomach pain. Patients in Class 4 tended to report severe complaints and medical problems that require serious treatment or medication, such as deafness or blindness. read more