(Sample) Size Matters

Sample Size Matters

On this blog and others, on twitter (@mwkraus), at conferences, and in the halls of the psychology building at the University of Illinois, I have engaged in a wealth of important discussions about improving research methods in social-personality psychology. Many prominent psychologists have offered several helpful suggestions in this regard (here, here, here, and here).

Among the many suggestions for building a better psychological science, perhaps the simplest and most parsimonious way to improve research methods is to increase sample sizes for all study designs: By increasing sample size researchers can detect smaller real effects and can more accurately measure large effects. There are many trade-offs in choosing appropriate research methods, but sample size, at least for a researcher like me who deals in relatively inexpensive data collection tools, is in many ways the most cost effective way to improve one's science. In essence, I can continue to design the studies I have been designing and ask the same research questions I have been asking (i.e., business-as-usual) with the one exception that each study I run has a larger N than it would have if I were not thinking (more) intelligently about statistical power.

How has my lab been fairing with respect to this goal of collecting large samples? See for yourself:

4 Reasons Not to Settle in a Relationship

Settling is an ugly, depressing word. Few people would suggest outright that you should settle for less than you want and deserve in a relationship. Even Lori Gottlieb, author of Marry Him: The Case for Settling for Mr. Good Enough, disapproved of the use of the word in her book title, a decision she said was made by her publisher.

But the pressure to settle can be very real, even if it is not communicated explicitly. People who are single after a certain age may be seen as "too picky" and urged to lower their standards. Singles are also likely to face social stigma due to their solo status, a phenomenon psychologist Bella DePaulo has called “singlism.” From our earliest days, we learn that our worth is tied up in our ability to find a mate; that marriage marks the passage into mature adulthood and is our most important adult relationship; and that we are not complete until we find our other half. And then there is the issue of our "biological clocks," an imperative which recent research suggests affects men too.

It's no wonder that people feel rushed to settle down before they are ready, or before they find the right match.

If you have ever found yourself grappling with the question of whether it's better to be alone, or to settle—which Gottlieb calls “one of the most complicated, painful, and pervasive dilemmas many single [people] are forced to grapple with"—read on. Here are four science-backed reasons why you should consider holding out for a relationship that makes you truly happy:

Why Do We Take Personality Tests?

I often get questions from friends and family that they would like answered in a post. This month, my post is inspired by a question from my grandmother. Kudos to my grandma for asking a question about a popular trend on the internet!

Personality tests

Personality tests are not new, but they have recently skyrocketed in popularity on the internet. This week, Buzzfeed published 15 such tests in one 24-hour period. It seems every day on my Facebook news feed, someone has posted new results from one of these quizzes. Online personality tests have expanded beyond the traditional format of telling us certain traits we possess, although those do still exist (try here and here). Now, there are also tests that give us information about ourselves by comparing us to people or characters we know (“Which pop star should you party with?” or “Which children’s book character are you?”) and by comparing specific behaviors or knowledge to others’ (“How many classic horror films have you seen?” or “How well do you know ‘90s R&B lyrics?”).

source

Regardless of which type of personality test you prefer (I’m not sure that all of these can be considered tests of personality, but we’ll stick with that label for now), these tests have two things in common: they ask us questions about ourselves, and then they tell us about ourselves. But aren’t we the experts on ourselves? Why should we need to take these tests to figure out who we are? Though it seems that the clues to our personality simply lie within us, below I outline three reasons we might be motivated to take personality tests anyway. 

The Psychology of Economic Inequality: A Collection

Today I wrote an op-ed piece for livescience about economic inequality. Read the piece here. In it, I argue that though economic inequality is a complex social and political issue, it may be explained, at least in part, in terms of the basic psychological motivations of individuals.

Anyway, I hope you'll check out the piece and send me comments via twitter (@mwkraus). If you'd like to read more about this area of research, below I have collected four past PYM pieces on the topic.