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Comparison of Modern Methods for Analyzing Repeated Measures Data with Missing Values
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Vallejo, G.; Fernandez, M. P.; Livacic-Rojas, P. E.; Tuero-Herrero, E. – Multivariate Behavioral Research, 2011
Missing data are a pervasive problem in many psychological applications in the real world. In this article we study the impact of dropout on the operational characteristics of several approaches that can be easily implemented with commercially available software. These approaches include the covariance pattern model based on an unstructured…
Descriptors: Personality Problems, Psychosis, Prevention, Patients
Is There a Geometric Module for Spatial Orientation? Insights from a Rodent Navigation Model
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Sheynikhovich, Denis; Chavarriaga, Ricardo; Strosslin, Thomas; Arleo, Angelo; Gerstner, Wulfram – Psychological Review, 2009
Modern psychological theories of spatial cognition postulate the existence of a geometric module for reorientation. This concept is derived from experimental data showing that in rectangular arenas with distinct landmarks in the corners, disoriented rats often make diagonal errors, suggesting their preference for the geometric (arena shape) over…
Descriptors: Cues, Spatial Ability, Geometric Concepts, Information Processing
Further Defining the Language Impairment of Autism: Is There a Specific Language Impairment Subtype?
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Whitehouse, Andrew J. O.; Barry, Johanna G.; Bishop, Dorothy V. M. – Journal of Communication Disorders, 2008
Some children with autism demonstrate poor nonword repetition--a deficit considered to be a psycholinguistic marker of specific language impairment (SLI). The present study examined whether there is an SLI subtype among children with autism. We compared the language abilities of children with SLI (n = 34, M age = 11;10 S.D. = 2;3), and children…
Descriptors: Autism, Language Impairments, Short Term Memory, Children
A Cautionary Tale about Levene's Tests for Equal Variances
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Nordstokke, David W.; Zumbo, Bruno D. – Journal of Educational Research & Policy Studies, 2007
The central messages of this paper are that (a) unequal variances may be more prevalent than typically imagined in educational and policy research, and (b) when considering tests of equal variances one needs to be cautious about what is being referred to as "Levene's test" because Levene's test is actually a family of techniques. Depending on…
Descriptors: Statistical Analysis, Educational Policy, Educational Research, Computer Software
Why Multivariate Methods Are Usually Vital in Research: Some Basic Concepts.
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Thompson, Bruce – 1994
The present paper suggests that multivariate methods ought to be used more frequently in behavioral research and explores the potential consequences of failing to use multivariate methods when these methods are appropriate. The paper explores in detail two reasons why multivariate methods are usually vital. The first is that they limit the…
Descriptors: Analysis of Covariance, Behavioral Science Research, Causal Models, Correlation
Common Methodology Mistakes in Dissertations, Revisited.
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Thompson, Bruce – 1994
Dissertations are an important component of the effort to generate knowledge. Thus, dissertation quality may be seen by accreditation and coordinating-board reviewers as a noteworthy reflection on the quality of doctoral programs themselves. The present study reviews methodological errors within Ph.D. dissertations. The illustrative errors are…
Descriptors: Behavioral Science Research, Case Studies, Doctoral Dissertations, Error Patterns