Writing a Method Section

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Presentation transcript:

Writing a Method Section Describing measures Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

Steps in this tutorial 1) State the goals of this tutorial 2) What is a method section 3) What is in a method section 4) What is the measures part of a method section 5) What goes in the measures section 6) The specific elements of a measures section 7) Detailed example of a measures section Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

Goals of this tutorial Explain the purpose of a method section Demonstrate the measures section of the method section Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

Objectives By the end of this tutorial you should be able to Articulate what the method section of a psychology paper is State what goes in that section State the components of a measures section Draft a measures section for your own work Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

What is a Method Section? It is the part of the proposal or research paper that describes the methods used to collect the data It follows the introduction It allows the reader to understand how the data were collected, and to judge for herself if she thinks the methods were good It should be detailed enough for a good researcher to be able to replicate the study from reading the method section Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

What is the Method section? The method section contains several sections Participants Who was in the study Procedure What happened study Measures/Materials What measures were used—like surveys Or what materials—like special lab equipement Analysis section-not covered in these tutorials Describes the statistical analysis Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

Method Section-Measures This tutorial demonstrates the measures or materials section Other tutorials cover the participants and procedures sections Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

What are Measures? Measures are the source of the actual data These can be Interviews Surveys Measurements of physical characteristics Height weight Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

Why describe measures? Because measures are the source of your data, all the results rest on whether or not the measures are adequate Describing the measures helps the reader judge whether or not the results are valid The measures section may be a lengthy and detailed section Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

Measures Measures include the following elements: The construct or variable being measured The name of the measure A citation for the measure if it is published How many items there are A sample item How items are scored What higher and lower scores mean Research or data supporting the reliability of the measure Research supporting the validity of the measure Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

A construct or variable being measured A construct is an idea or concept A construct might be depression, aggression, abuse, agitation There can be more than one measure for a single construct There can be several constructs in one study A variable is simply something that is measured Like height, weight or income Many studies measure constructs and variables Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

Name of the Measure/Citation Constructs such as anxiety, risk behaviors, attitudes about marriage, etc., are likely (hopefully) using an existing measure. Existing measures have formal names and usually abbreviations If it is a published measure it should be cited Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

Construct/Measure name/Citation-Example Two measures of child behavior problems Child Behavior Problems Parent reported child behavior problems were measured with the Child Behavior Checklist (CBCL; Achenbach & Edelbrock, 1991)… Parent reported child behavior problems were also measured with the Eyberg Child Behavior Inventory (ECBI; Eyberg & Pincus, 1999)… Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

Notes on the Example Child behavior problems is the construct The first measure is the Child Behavior Checklist, abbreviated CBCL The authors are cited using proper citation style The second measure is the Eyberg Child Behavior Inventory, abbreviated ECBI. Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

A sample item It is very helpful for the reader to include an actual question or item from the measure that is described This helps the reader see how items are worded How long items may be How complicated wording may be What types of issues are asked about Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

How Items are Scored Items may be scored in different ways, such as True/false Never, rarely, sometimes, often, always Word scoring is often assigned a number This should be described so the reader can understand the choices participants had for answering questions This helps the reader judge if the measure was adequate Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

Number of items/Sample item/Scoring-Example Here is an example The CBCL is a 113 item checklist of behavior problems. Parents are asked how often each behavior occurs compared to their experience of other similar age children currently or within the past 6 months. Items are scored on a scale of (0)= not true, (1)=sometimes true, and (2)= often true. Sample items include “bites fingernails” and “argues a lot.” Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

What high and low scores mean Reader don’t automatically know what high and low scores mean For instance, that a higher score on a depression scale means more depressive symptoms Scales are not always scored in obvious ways Readers need to know exactly what the range of possible scores is, and what higher or lower scores represent Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

Range and High and Low Scores-Example For a measure of psychopathy The PCL-R has 20 items and possible scores range from 0 to 40, where higher scores indicate more psychopathic behaviors and attitudes. Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

Reliability and Validity of a Measure There must be evidence that a measure is reliable and valid Usually this will come from the published literature Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

Reliability of a Measure Descriptions should state support for the reliability of the measure Different types of reliability may be important for a measure Test-retest reliability and internal consistency reliability for survey measures Interrater reliability for observational measures Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

Reliability of the Measure-Example For a survey measure The Beck Anxiety Inventory has been shown to have one-week test-retest reliability of .75 (Beck, Epstein, Brown & Steer, 1988). Internal consistency reliability in the current sample was .80. Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

Validity of the Measure There are many many types of validity Measure do not have to be shown to be valid in all ways But some evidence of validity is usually necessary Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

Validity of the Measure-Example For a survey measure The Beck Anxiety Inventory has been shown to be able to discriminate anxious from non-anxious patients, and is also correlated with other measures of anxiety (Beck, Epstein, Brown & Steer, 1988). Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

Measures-Summary Measures needs to be clearly described so the reader can understand what how the constructs and variables of interest were measured, and judge if the measures were good There are several components to describing a measure Describing a measure usually requires citations from the published literature Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell

Summary This tutorial explained the purpose and parts of a method section of an empirical paper or proposal It reviewed in detail the specific components that may be in a measures section It demonstrated several examples of measures sections Created by Alice Frye, Ph.D., Department of Psychology, University of Massachusetts, Lowell