The Use of Research Methods in Psychological Research: A Systematised Review

Research designs of publications in radiography professional journals - A modified bibliometric analysis

INTRODUCTION

Evidence based practice relies on availability of research evidence mostly through peer-reviewed journal publications. No consensus currently exists on the best hierarchy of research evidence, often categorised by the adopted research designs. Analysing the prevalent research designs in radiography professional journals is one vital step in considering an evidence hierarchy specific to the radiography profession and this forms the aim of this study.

METHODS

Bibliometric data of publications in three Radiography professional journals within a 10-year period were extracted. The Digital Object Identifier were used to locate papers on publishers' websites and obtain relevant data for analysis. Descriptive analysis using frequencies and percentages were used to represent data while Chi-square was used to analyse relationship between categorical variables.

RESULTS

1830 articles met the pre-set inclusion criteria. Quantitative descriptive studies were the most published design (26.6%) followed by non-RCT experimental studies (18.7%), while Randomised Controlled Trials (RCT) were the least published (1.0%). Systematic reviews (42.9%) showed the highest average percentage increase within the 10-year period, however RCTs showed no net increase. Single-centre studies predominated among experimental studies (RCT = 88.9%; Non-RCT = 95%). Author collaboration across all study designs was notable, with RCTs showing the most (100%). Quantitative and qualitative studies comparatively had similar number of citations when publication numbers were matched. Quantitative descriptive studies had the highest cumulative citations while RCTs had the least.

CONCLUSION

There is a case to advocate for more study designs towards the peak of evidence hierarchies such as systematic reviews and RCT. Radiography research should be primarily designed to answer pertinent questions and improve the validity of the profession's evidence base.

IMPLICATION FOR PRACTICE

The evidence presented can encourage the adoption of the research designs that enhances radiography profession's evidence base.

In models we trust: preregistration, large samples, and replication may not suffice

Despite discussions about the replicability of findings in psychological research, two issues have been largely ignored: selection mechanisms and model assumptions. Both topics address the same fundamental question: Does the chosen statistical analysis tool adequately model the data generation process? In this article, we address both issues and show, in a first step, that in the face of selective samples and contrary to common practice, the validity of inferences, even when based on experimental designs, can be claimed without further justification and adaptation of standard methods only in very specific situations. We then broaden our perspective to discuss consequences of violated assumptions in linear models in the context of psychological research in general and in generalized linear mixed models as used in item response theory. These types of misspecification are oftentimes ignored in the psychological research literature. It is emphasized that the above problems cannot be overcome by strategies such as preregistration, large samples, replications, or a ban on testing null hypotheses. To avoid biased conclusions, we briefly discuss tools such as model diagnostics, statistical methods to compensate for selectivity and semi- or non-parametric estimation. At a more fundamental level, however, a twofold strategy seems indispensable: (1) iterative, cumulative theory development based on statistical methods with theoretically justified assumptions, and (2) empirical research on variables that affect (self-) selection into the observed part of the sample and the use of this information to compensate for selectivity.

High-School Students’ Continuous Engagement in Taekwondo Activity

Abstract: Background: Previous research has not investigated why and how adolescents decide to continuously engage in Taekwondo activity, which, based on self-determination theory, has positive effects on diverse (physical, psychological, social) aspects. This study examines the structural relationship between three psychological needs (autonomy, competence, relatedness), intrinsic motivation, and intentions for Taekwondo activity continuity among high-school students participating in Taekwondo training programs. Methods: High-school students (130 males, 110 females) representing multiple nationalities participated in Taekwondo lessons for one session. During the last session class, they completed three questionnaires, and the collected data were analyzed using structural equation modeling. Results: The results revealed that the satisfaction of three psychological needs was positively and directly associated with intrinsic motivation at a statistically significant level. Additionally, intrinsic motivation directly and positively contributed to intentions for Taekwondo activity continuity and mediated the relationship between the satisfaction of psychological needs and intentions to continue Taekwondo at levels of statistical significance. Discussion: The findings indicate that, if high-school students meet three psychological needs during Taekwondo classes, they are likely to internalize positive feelings such as interest, enjoyment, and satisfaction. Further, intrinsically motivated students would be highly willing to continually engage in Taekwondo activity.