Specific Research Designs for Randomized Experimental and Quasi- Experimental Approaches

2000 ◽  
pp. 103-118
10.28945/3521 ◽  
2016 ◽  
Vol 15 ◽  
pp. 283-303 ◽  
Author(s):  
Jesús Moreno León ◽  
Gregorio Robles ◽  
Marcos Román-González

The introduction of computer programming in K-12 has become mainstream in the last years, as countries around the world are making coding part of their curriculum. Nevertheless, there is a lack of empirical studies that investigate how learning to program at an early age affects other school subjects. In this regard, this paper compares three quasi-experimental research designs conducted in three different schools (n=129 students from 2nd and 6th grade), in order to assess the impact of introducing programming with Scratch at different stages and in several subjects. While both 6th grade experimental groups working with coding activities showed a statistically significant improvement in terms of academic performance, this was not the case in the 2nd grade classroom. Notable disparity was also found regarding the subject in which the programming activities were included, as in social studies the effect size was double that in mathematics.


1979 ◽  
Vol 9 (3) ◽  
pp. 307-315 ◽  
Author(s):  
Gerald M. Devins

Ethical and pragmatic considerations often preclude the application of classical experimental approaches to in vivo thanatological research. While quasi-experimental and correlational designs may be employed to circumvent a number of potential problems, many more empirically testable research questions simply remain unaskable in the applied setting. Clearly, extra-experimental sources of information are of particular value in such situations. The present paper reports some of the observations and subjective reactions experienced by the writer while engaged in a series of experimental thanatological research studies. The issues addressed include the motivations of thanatological investigators and research participants, personal awareness of death, displacement of grief, anxieties about personal utility, paternalism, and honesty (i.e., frankness) as a primary ethic in facilitating a peaceful, “natural,” death in the moribund individual.


2020 ◽  
Vol 8 (2) ◽  
pp. 410-437 ◽  
Author(s):  
Nancy Getchell ◽  
Nadja Schott ◽  
Ali Brian

Throughout this special issue, different authors have discussed diverse aspects of past, present, and future motor development research. In such research, understanding how people move involves much more than studying motor behavior in individuals of different ages. Rather, empirical designs should embed some element of past, present, and future motor behavior into research questions, designs, methodologies, and interpretations. In this article, we provide an overview on the process of asking movement-related developmental questions and designing appropriate research studies that will answer them to provide a foundation for both new and returning investigators interested in studying human motor development. We compare descriptive and experimental approaches as well as longitudinal, cross-sectional, and alternative research designs, followed by a discussion of common statistical analyses suited for these designs. Through this discussion, we offer suggestions for the most appropriate ways in which to study developmental change. We finish with our thoughts on future directions for investigational methods within motor development research.


2019 ◽  
Vol 109 (1) ◽  
pp. 203-236 ◽  
Author(s):  
Bhaven Sampat ◽  
Heidi L. Williams

We investigate whether patents on human genes have affected follow-on scientific research and product development. Using administrative data on successful and unsuccessful patent applications submitted to the US Patent and Trademark Office, we link the exact gene sequences claimed in each application with data measuring follow-on scientific research and commercial investments. Using these data, we document novel evidence of selection into patenting: patented genes appear more valuable—prior to being patented— than non-patented genes. This evidence of selection motivates two quasi-experimental approaches, both of which suggest that on average gene patents have had no quantitatively important effect on follow-on innovation. (JEL I10, O31, O34)


Author(s):  
John C. Norcross ◽  
Thomas P. Hogan ◽  
Gerald P. Koocher ◽  
Lauren A. Maggio

Evidence-based practice depends on research as its key source, and that research follows one of several designs. This chapter identifies commonly used research designs, terms used in their application, and the special strengths and weaknesses of each design. Designs include randomized clinical trials, quasi-experimental designs, surveys, and case study methods. Discussion of multivariate methods covers the important role of partial correlation and its applications in multiple regression, structural equation modeling, factor analysis (both exploratory and confirmatory), and mediator analysis. The chapter further details the role of the hypothesis in the designs, types of errors (I and II) affecting conclusions, and the role of power in statistical tests. Critical factors in drawing causal conclusions from the various designs receive special attention throughout.


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