Dr. Martin Lea A quick video and instructions to help you import your publications into you academic website. Google Scholar will export your publications list in BibTeX format. This method uses an online convertor to convert the BibTeX format into one of several standard reference list formats, such as APA, which you can then paste into your Publications … Read more
This guide will help you to build a list of your publications in a format you need to create a page on your academic website. I’ve created this guide because I often find that the list of publications people keep in their CV does not display well on a website. This is usually because the … Read more
It will take a while for Google to understand a new academic website. Over the first few weeks it will crawl and index your pages and analyze visitor behaviour. Until then Google search results can be a bit random; in time it will settle down so that when someone searches your name it will either … Read more
Path analysis and structural equation modeling are techniques to assess the direct causal contribution of one variable to another in a non experimental situation. They are therefore particularly useful in field studies, and have become increasingly popular as modern psychology draws from real problems and non-laboratory research methods. However, as I’ll show, path analysis can … Read more
Path models are built up from basic models of moderation and/or mediation. It is common in psychology for the terms moderator and mediator to be used interchangeably. However, they are conceptually different. “In general terms, a moderator is a qualitative (e.g., sex, race class) or quantitative (e.g., level of reward) variable that affects the direction … Read more
What is Simple Regression? What is Multiple Regression? In simple regression a single dependent or criterion variable is related to a single independent variable or predictor variable. Multiple regression is an extension of simple regression in which the criterion is regressed against several potential predictors. For example, a simple regression might be: can marital … Read more
A field study is reported in which friendships were sampled at 1 month, 4 months and 12 months duration. Friendship variables were measured at each time-point using the Acquaintance Description Form (ADF), and the degree of value similarity was also assessed. Scores on 8 ADF variables were regressed on common similarity (that was easy to … Read more
A flurry of newspaper articles highlight albeit in dramatic fashion, an important issue about privacy and children’s digital rights when parents posts photos and details about their childhood on social media. The research report from Alexis Hiniker at the University of Washington and Sarita Schoenebeck at the University of Michigan is illuminating about children’s views.
[clear]What you need to consider and the criteria you should use for choosing an email marketing service for your small business. Over the last few months I’ve been trying out a range of Email Marketing Services on behalf of my small business clients. In the course of doing it became clear to me just how important … Read more
Incidents referred to in articles on psychological and behavioural responses to disaster including CBRN. A number of specific incidents are referred to throughout our articles on disaster resilience and disaster psychology. They are listed below, in alphabetical order, along with the date on which they occurred and a brief description. Those incidents that involve CBRN … Read more
This example illustrates the importance of clearly specifying your theory in terms of moderators and mediators. It’s taken from an advisory session with a PhD student who approached me to discuss how to test her theory. Her project was looking at the link between language deficit and self-esteem in young adults. Her hypothesis was that the effects of … Read more
The simplest mediation analysis involves a single independent variable, a dependent variable, and a hypothesized mediator. The unmediated model is represented by the direct effect of x on y, quantified as c. However, the effect of X on Y may be mediated by a process, or mediating variable M. Complete mediation is said to occur … Read more
So how do we go about doing a mediation analysis? In the next four posts I’ll take you through the main approaches to testing for a significant mediation effect. We’ll first look at the Causal Steps approach, made famous by Baron & Kenny (1986). Then we’ll look at several modern approaches for testing the significance … Read more
Let’s start by decomposing mediation into a number of causal steps as described by Baron & Kenny (1986). We’ll use our mediation model for the effects of Visual Anonymity on Group Attraction, mediated by Self-Categorization. The fist step is to show that the initial variable affects the outcome. In our model, we need to show … Read more
In the second step, we need to show that the initial, or predictor, variable affects the mediator. So we perform another simple linear regression using the mediator as if it were the outcome variable and regressing it on the predictor, which gives us an estimate of path a. In our example, path a describes the … Read more
Steps 3 and 4 are conducted simultaneously using multiple regression. Step 3 consists of regressing the outcome variable y onto both the mediator, m, and the predictor, x to provide an estimate of path b. Note: it is not sufficient just to correlate the mediator with the outcome; the mediator and the outcome may be … Read more
This slide summarizes Barron & Kenny’s (1986) causal steps for establishing mediation, which we have just discussed. However, do all of the steps have to be met for there to be mediation? Certainly, Step 4 does not have to be met unless the expectation is for complete mediation. Moreover, Step 1 is not required, but … Read more
Statistics Training: Introduction to Path Analysis
Statistics Training: Introduction to Path Analysis
Statistics Training: Introduction to Path Analysis
