Recent R Videos 

Recent SPSS Videos

SPSS Video Tutorials

Rotting Apple: From Dedicated Apple Fan to Disenchanted In 30 Short Minutes

Rotting Apple: From Dedicated Apple Fan to Disenchanted In 30 Short Minutes

Anyone reading this blog knows what an "Apple Evangelist" looks and sounds like. You might not know that label, but you recognize them living and working around you. They are loyal to the Apple brand and serve as walking billboards, often toting multiple devices that plant the Apple seed. When asked (and sometimes even when not), these loyal users are eager to declare Apple's products and customer service superior. I know them well because I've been one for many years. I bought my first Macbook in 2005 and I never turned-back, perhaps until now. I fear times are changing at Apple and not for the better. 

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The Time For Understanding Reproducible Research Is Now

The Time For Understanding Reproducible Research Is Now

Reproducible research (RR) provides a road map through a study. In other words, conducting RR means engaging in a transparent analytic process. This prospect can be both exciting and terrifying. 

Many of us harbor a burning fear that we will be "found out" as someone trying to "fake it until we make it." No matter how many goals we reach or degrees we earn, a hint of doubt remains. This doubt can keep us humble, vigilant, and hungry for professional growth. For some, a potent mix of doubt and fear is fuel for ambition. Unfortunately, this same combination can also make RR a scary concept.

 

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Introduction to R Programming

Introduction to R Programming

The following is one of the best introductions to R programming that I've found online. It is part of a larger series of tutorials created by Jared Knowles called R Bootcamp. Jared's tutorials are a valuable resource for anyone try to learn to program in R. Below the presentation are links to the handouts and R Code that are used during the HTML5 presentation that is linked below. Enjoy!

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How to Plot Interaction Effects in SPSS Using Predicted Values

How to Plot Interaction Effects in SPSS Using Predicted Values

So you've run your general linear model (GLM) or regression and you've discovered that you have interaction effects. Now what? Next, you might want to plot them to explore the nature of the effects and to prepare them for presentation or publication! The following is a tutorial for who to accomplish this task in SPSS. A follow-up tutorial for how to do this in R is forth coming.

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Using the lavaan package (in R) for latent variable modeling (SEM)

Using the lavaan package (in R) for latent variable modeling (SEM)

This is a fantastic resource created by Dr. William Revelle for running confirmatory factor analysis (CFA) models and structural equation models (SEM) in R using the lavaan package. The tutorial walks through example models, includes example code, discusses multi-group analysis, and even references some advanced functions for producing path diagrams using the psych package in R. 

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Confusing Stats Terms Explained: Internal Consistency

Confusing Stats Terms Explained: Internal Consistency

Internal consistency refers to the general agreement between multiple items (often likert scale items) that make-up a composite score of a survey measurement of a given construct. This agreement is generally measured by the correlation between items.

For example, a survey measure of depression may include many questions that each measure various aspects of depression, such as:

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R Is Not So Hard! A Tutorial, Part 4 (repost)

R Is Not So Hard! A Tutorial, Part 4 (repost)

Part 3 we used the lm() command to perform least squares regressions. In Part 4 we will look at more advanced aspects of regression models and see what R has to offer. One way of checking for non-linearity in your data is to fit a polynomial model and check whether the polynomial model fits the data better than a linear model. Or you may wish to fit a quadratic or higher model because you have reason to believe that the relationship between the variables is inherently polynomial in nature.

Let’s see how to fit a quadratic model in R...

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Confusing Stats Terms Explained: Heteroscedasticity (Heteroskedasticity)

Confusing Stats Terms Explained: Heteroscedasticity (Heteroskedasticity)

Heteroscedasticity is a hard word to pronounce, but it doesn't need to be a difficult concept to understand. Put simply, heteroscedasticity (also spelled heteroskedasticity) refers to the circumstance in which the variability of a variable is unequal across the range of values of a second variable that predicts it.

A scatterplot of these variables will often create a cone-like shape, as the scatter (or variability) of the dependent variable (DV) widens or narrows as the value of the independent variable (IV) increases. The inverse of heteroscedasticity is homoscedasticity...

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How to Create APA Style Graphs and Then Teach SPSS to Do it Automatically!

How to Create APA Style Graphs and Then Teach SPSS to Do it Automatically!

In the strictest sense, APA style discourages the use of color in graphics, stipulating that it be used only when it is "absolutely necessary". Consequently, most universities and dissertation committees also discourage (or downright forbid) the use of color graphics in dissertation manuscripts. Personally, i find this irritating, as I think most graphical representations of data can be made more clear with the appropriate use of color. However, I suppose the guideline is meant to provide uniformity and consistency across manuscripts, which is understandable.

Unfortunately, if you use SPSS you've probably already discovered that it produces graphics in color by default. Not to worry, your graphs can be changed easily. Better yet, you can make simple adjustments to your SPSS settings that will force the program to create APA-compliant (i.e. black & white) graphics in all output! Here is how you do it...

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Wonderful "How-To" Resources for Learning Structural Equation Modeling (SEM) with AMOS

Wonderful "How-To" Resources for Learning Structural Equation Modeling (SEM) with AMOS

Structural equation modeling (SEM) is a complex beast, and can be quite intimidating to someone trying to learn the basics. Fortunately, there are some great resources out there for learning! Unfortunately, I think a lot of beginners don't know what those great resources are, or where to find them.

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Why You Shouldn't Conclude "No Effect" from Statistically Insignificant Slopes (repost)

Why You Shouldn't Conclude "No Effect" from Statistically Insignificant Slopes (repost)

It is quite common in political science for researchers to run statistical models, find that a coefficient for a variable is not statistically significant, and then claim that the variable "has no effect." This is equivalent to proposing a research hypothesis, failing to reject the null, and then claiming that the null hypothesis is true (or discussing results as though the null hypothesis is true). This is a terrible idea. Even if you believe the null, you shouldn't use p > 0.05 as evidence for your claim. In this post, I illustrate why...

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How to Conduct a Repeated Measures MANCOVA in SPSS

How to Conduct a Repeated Measures MANCOVA in SPSS

In today's blog entry, I will walk through the basics of conducting a repeated-measures MANCOVA in SPSS. I will focus on the most basic steps of conducting this analysis (I will not address some complex side issues, such as assumptions, power…etc). If you find yourself with lingering questions after walking through this blog, feel free to leave questions in the "comments" section, or visit the MANCOVA section of my discussion forum to find answers and/or ask questions of your own. Full disclosure: the example data used is from the SPSS sample/help files, and it can be downloaded below...

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The Worst Mistake Made on a Dissertation Is...

I have a saying that I like to tell consulting clients, which is easier said than done, but I think are words for doctoral candidates to live by: "The only bad dissertation draft is one that isn't turned-in." The most common factor that unnecessarily slows progress on a dissertation proposal or defense is a propensity to strive for the perfect draft. As a graduate student, we all fantasized of turning-in our first draft and having our advisor, being so amazed at its brilliance, insist that you accept your PhD on the spot...

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Moderating Effects with Seemingly Uncorrelated Variable

Moderating Effects with Seemingly Uncorrelated Variable

I received a great question this week, which asked: In order for a moderating relationship to exist, do the predictor IV and dependent  variable need to be significantly correlated?". This is a question that I am asked a lot, partly because of the common confusion between mediators and moderators and the commonly held belief that an IV and DV should be related for mediation to be present (see my video blog on Mediators, Moderators, and Suppressors for more info on this topic).  However, moderators are a completely different story...

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Using Syntax to Assign 'Variable Labels' and 'Value Labels' in SPSS

Using Syntax to Assign 'Variable Labels' and 'Value Labels' in SPSS

Preparing a dataset for analysis is an arduous process. Besides recoding and cleaning variables, a diligent data analyst also must assign variable labels and value labels, unless they choose to wait until after your output is exported to Microsoft Word. Unfortunately, that option only leaves additional opportunity for error and confusion, not to mention the inefficiency of editing tables in Microsoft Word...

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How to make SPSS produce all tables in APA format automatically!

How to make SPSS produce all tables in APA format automatically!

Formatting a graph that was exported from SPSS to Microsoft Word can be an absolute pain. Since neither program is known for it's simplicity or "user-friendliness", the interaction between the two can be predictably tedious and frustrating. The process of converting a standard SPSS table to APA format might be bearable, when you are talking about a single table, but can become overwhelming when you have an entire manuscript worth of tables. Fortunately, a few minor alterations to your SPSS settings can make SPSS do most of the heavily lifting for you, making SPSS automatically produce tables that closely resemble APA format and cutting down your formatting time by as much as 90%!

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Confusing Stats Terms Explained: Residual

When I hear the word "residual", the pulp left over after I drink my orange juice pops into my brain, or perhaps the film left on the car after a heavy rain. However, when my regression model spits out an estimate of my model's residual, I'm fairly confident it isn't referring to OJ or automobile gunk...right?  Not so fast, that imagery is more similar to it's statistical meaning than you might initially think.

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Confusing Stats Terms Explained: Multicollinearity

Multicollinearity said in "plain English" is redundancy. Unfortunately, it isn't quite that simple, but it's a good place to start.  Put simply, multicollinearity is when two or more predictors in a regression are highly related to one another, such that they do not provide unique and/or independent information to the regression.

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Top Ten Tips for Data Analysis to Make Your Research Life Easier!

While there is no "magic bullet" to make stats and data analysis easy to understand and helpful in our research, there are some things that you can do to avoid pitfalls and help things run smoothly. This "top ten" list offers a few of those things that I think you will find helpful! I'll be posting a video of this list later today on my Stats Videos page.

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