A practical introduction to methods for analyzing longitudinal data in the presence of missing data using a marijuana price survey. Issue 2 (5th May 2015)

• Record Type: Journal Article
• Authors: Mark Shevlin, Professor; Miles, Jeremy N.V; Hunt, Priscillia
• Is Part Of: Journal of criminal psychology. Volume 5:Issue 2(2015)
• Page Start: 137
• Page End: 148
• Publication Date: 2015-05-05
• Subjects: Criminal psychology -- Periodicals; Criminal investigation -- Periodicals; Criminal behavior, Prediction of -- Periodicals; 364.3
• DOI: 10.1108/JCP-02-2015-0007
• Languages: English
• ISSNs: 2009-3829

Abstract

<abstract> <title> <x content-type="archive" xml:space="preserve">Abstract</x> </title> <sec> <title content-type="abstract-heading">Purpose</title> <p> – In applied psychology research settings, such as criminal psychology, missing data are to be expected. Missing data can cause problems with both biased estimates and lack of statistical power. The paper aims to discuss these issues. </p> </sec> <sec> <title content-type="abstract-heading">Design/methodology/approach</title> <p> – Recently, sophisticated methods for appropriately dealing with missing data, so as to minimize bias and to maximize power have been developed. In this paper the authors use an artificial data set to demonstrate the problems that can arise with missing data, and make naïve attempts to handle data sets where some data are missing. </p> </sec> <sec> <title content-type="abstract-heading">Findings</title> <p> – With the artificial data set, and a data set comprising of the results of a survey investigating prices paid for recreational and medical marijuana, the authors demonstrate the use of multiple imputation and maximum likelihood estimation for obtaining appropriate estimates and standard errors when data are missing. </p> </sec> <sec> <title content-type="abstract-heading">Originality/value</title> <p> – Missing data are ubiquitous in applied research. This paper demonstrates that techniques for handling missing data are accessible and should be employed by researchers.</p> </sec> </abstract>