If you have a categorical predictor variable that you plan to use in a regression analysis in SPSS, there are a couple ways to do it. You can use ... Continue Reading
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Blog Posts
Best Practices for Formatting Date Variables
Formatting Date Variables seems like it should be straightforward, but sadly, it's not. If you are given data that includes dates, expect ... Continue Reading
Member Training: Moderated Mediation, Not Mediated Moderation
Moderated mediation, also known as Conditional Process Modeling, is great tool for understanding one type of complex relationship among variables. ... Continue Reading
Interpreting the Intercept in a Regression Model
Interpreting the Intercept in a regression model isn't always as straightforward as it looks. Here's the definition: the intercept (often labeled ... Continue Reading
The Difference Between the Bernoulli and Binomial Distributions
You might already be familiar with the binomial distribution. It describes the scenario where the result of an observation is binary—it can be one of ... Continue Reading
Member Training: The Link Between ANOVA and Regression
If you’ve used much analysis of variance (ANOVA), you’ve probably heard that ANOVA is a special case of linear regression. Unless you’ve seen why, ... Continue Reading
Can Likert Scale Data ever be Continuous?
A very common question is whether it is legitimate to use Likert scale data in parametric statistical procedures that require interval data, such as ... Continue Reading
What is a Dunnett’s Test?
I’m a big fan of Analysis of Variance (ANOVA). I use it all the time. I learn a lot from it. But sometimes it doesn’t test the hypothesis I need. In ... Continue Reading
Member Training: Multinomial Logistic Regression
Multinomial logistic regression is an important type of categorical data analysis. Specifically, it's used when your response variable is nominal: ... Continue Reading
Getting Started with SPSS Syntax
You may have heard that using SPSS syntax is more efficient, gives you more control, and ultimately saves you time and frustration. It's all ... Continue Reading
When the Results of Your ANOVA Table and Regression Coefficients Disagree
Have you ever had this happen? You run a regression model. It can be any kind—linear, logistic, multilevel, etc. In the ANOVA table, the effect of ... Continue Reading
Member Training: Centering
Centering variables is common practice in some areas, and rarely seen in others. That being the case, it isn’t always clear what are the reasons for ... Continue Reading
Confusing Statistical Term #13: Missing at Random and Missing Completely at Random
One of the important issues with missing data is the missing data mechanism. You may have heard of these: Missing Completely at Random (MCAR), Missing ... Continue Reading
What is a Completely Randomized Design?
The most basic experimental design is the completely randomized design. It is simple and straightforward when plenty of unrelated subjects are ... Continue Reading
Member Training: Translating Between Multilevel and Mixed Models
Multilevel and Mixed models are essentially the same analysis. But they use different vocabulary, different notation, and approach the analysis ... Continue Reading
Three SPSS Shortcuts that Make Life Easier
Okay, maybe these SPSS shortcuts won't make your whole life easier, but it will help your work life, at least the SPSS part of it. When I consult ... Continue Reading
The Difference between Chi Square Tests of Independence and Homogeneity
A chi square test is often applied to two-way tables, like the one below. This table represents a sample of 1,322 individuals. Of these ... Continue Reading
Member Training: Introduction to Stata Software Tutorial
In this 8-part tutorial, you will learn how to get started using Stata for data preparation, analysis, and graphing. This tutorial will give you the ... Continue Reading
An Example of Specifying Within-Subjects Factors in Repeated Measures
Some repeated measures designs make it quite challenging to specify within-subjects factors. Especially difficult is when the design contains two ... Continue Reading
How the Population Distribution Influences the Confidence Interval
Spoiler alert, real data are seldom normally distributed. How does the population distribution influence the estimate of the population mean and its ... Continue Reading
Other Pages
Structural Equation Modeling
structural equation modeling resources Listed below are workshops, trainings, and articles to help you learn Structural Equation Modeling (SEM). SEM ... Continue Reading
Our Programs
how can The Analysis Factor help you with statistics? ... Continue Reading
Online Workshops
Currently Enrolling Analyzing Repeated Measures Data: ANOVA and Mixed Model Approaches Instructor: Karen Grace-Martin Stage: 3, ... Continue Reading
Fundamental Statistics
resources for fundamental statistics Use the resources here to learn fundamental statistics with The Analysis Factor. Listed Below are our Workshop, ... Continue Reading
Data Analysis Practice and Skills
Resources to improve your data analysis practice and skills As a data analyst, it's not enough to understand statistics or to be able to use the ... Continue Reading
Statistical Consulting Services
Hourly Consulting For when you need guidance and advice for a statistical plan or analysis. Perfect if you have: A need for an ... Continue Reading
Principal Component Analysis and Factor Analysis
principal component analysis and factor analysis resources Listed below are workshops, trainings, and articles to help you learn principal component ... Continue Reading
Survival Analysis and Event History Analysis
survival analysis and event history analysis resources Listed below are workshops, trainings, and articles to help you learn survival analysis, ... Continue Reading
SPSS
learn SPSS SPSS is a widely used program for statistical analysis in social science. It is also used by market researchers, health researchers, ... Continue Reading
Stata
Stata resources Stata is an extremely robust and popular general statistical software program. The Analysis Factor has numerous resources about ... Continue Reading
Complex Surveys & Sampling
complex surveys & sampling resources Listed below are workshops, trainings, and articles to help you learn about complex surveys. Complex surveys ... Continue Reading
Effect Size Statistics; Power and Sample Size Calculations; and Statistical Inference
effect size statistics, power and sample calculations, and statistical inference Use these resources to learn with The Analysis Factor. Listed below ... Continue Reading
R
learn R The statistical programming language R is becoming a popular means for analyzing data. But it’s not always easy to use. We have a number of ... Continue Reading
Count Regression Models
count regression models resources Like continuous variables, count variable are numerical. So it seems you should be able to apply methods for ... Continue Reading
Logistic Regression
logistic regression resources Listed below are workshops, trainings, and articles to help you learn logistic regression. Logistic regression is an ... Continue Reading
Mixed and Multilevel Models
mixed and multilevel models resources Listed below are workshops, trainings, and articles to help you learn Mixed, Hierarchical, and Multilevel ... Continue Reading
Linear Regression
linear regression resources Listed below are workshops, trainings, and articles to help you learn linear regression. Widely used, this family of ... Continue Reading
Analysis of Variance and Covariance
analysis of variance and covariance resources Listed below are workshops, trainings, and articles to help you learn Analysis of Variance (ANOVA) and ... Continue Reading
Missing Data
missing data resources I don't need to tell you, missing data stinks. And frankly, it's in just about every data set. These days, though, there are ... Continue Reading