SPSS Mean Centering and Interaction Tool By Ruben Geert van den Berg under SPSS Tools & Regression Also see SPSS Moderation Regression Tutorial. Regression with Moderation Effect Downloading and Installing the Mean Centering Tool Using the Mean Centering Tool Mean Centering Tool – Results A sports doctor wants to know if and how training and
Split-Half Reliability in SPSS By Ruben Geert van den Berg under Factor Analysis Quick Data Screening SPSS Split-Half Reliability Dialogs SPSS Split-Half Reliability Output Spearman-Brown & Horst Formulas Specifying our Test Halves A psychologist is developing a scale to measure “emotional stability”. She therefore administered her 15 items to a sample of N = 924
What is a T-Test? Types, Assumptions, and Calculations Explained Let’s be honest for a moment. For many of us in the mental health field, the word “statistics” triggers a mild fight-or-flight response. We entered this profession to understand the human mind, to help people navigate trauma, and to foster growth, not necessarily to crunch numbers.
Understanding Measurement Reliability and Validity A concerned parent takes their child to a psychologist to be assessed for ADHD. The clinician runs a battery of tests and concludes the child has the disorder. Seeking a second opinion, the parent visits a different psychologist a week later. Using the same tools, this new clinician concludes the
Process Capability: Measuring Mental Consistency & Potential Imagine a bakery. The air smells of vanilla and warm sugar. The baker’s goal is simple: produce thousands of muffins that are exactly the same size, shape, and weight. But humans aren’t muffins. And our minds aren’t factories. In my years working with clients, one of the most
Finding the “Best Fit”: An Intuitive Guide to Maximum Likelihood Estimation The Fear of the Unknown (and Statistics) If there is one thing that unites psychology students and mental health professionals across the globe, it is often a shared, quiet anxiety regarding one specific subject: Statistics. We entered this field to understand the human mind,
What Are Latent Variables? Measuring the Unmeasurable As a psychologist, I often sit with clients and discuss profound concepts: anxiety, intelligence, extraversion, or resilience. We know these things exist. We feel them. We see their impact on our lives every single day. But if you asked me to put “resilience” in a jar or weigh
Mystery of Cronbach’s Alpha: A Guide to Internal Consistency in Research You are a researcher—or perhaps a psychology student working on your thesis. You have a burning hypothesis. You believe that extroverted people earn higher salaries than introverted people. To prove this, you need data. You sit down, craft a brilliant questionnaire, and send it
Cohen’s Kappa Explained: Measuring Reliability in Psychology Research Imagine a patient named Sarah. She visits Dr. A because she’s been feeling persistently low, tired, and unmotivated. Dr. A conducts an assessment and diagnoses her with Major Depressive Disorder. Seeking a second opinion, Sarah visits Dr. B the following week. Dr. B asks similar questions but
Is Your Research Reliable? Understanding Fleiss’ Kappa Imagine you are the lead clinical psychologist at a busy diagnostic center. A new patient walks in displaying complex symptoms. You ask three different clinicians to assess this patient independently to determine if they meet the criteria for Major Depressive Disorder. Doctor A says “Yes.” Doctor B says