Archive | Uncategorized RSS feed for this section

Just how big is that effect size?

24 Jan

On Monday The Washington Post ran a story with this headline: “Teens who spend less time in front of screens are happier — up to a point, new research shows.”

What the article does not tell us (but the abstract does) is the that the study had 1.1 million participants. Well that seems like a good thing, doesn’t it?

The problem is that with a sample that large almost any correlation will be statistically significant. For example, according the Post account, the correlation between texting and happiness was r = -.05. Typically a correlation of the this magnitude would be described as “none or very weak.” 

 

The many voices of Nic De Houwer

19 Jan

 

And let’s not forget the work of the late great Mel Blanc:

 

400 failed Alzheimer’s drugs

15 Jan

An article in The Washington Post examines why it is so hard to find an effective drug to treat Alzheimer’s disease:

These setbacks pile on to an already depressing situation: more than 400 failed clinical trials since the last Alzheimer’s drug — which only treats the symptoms of the disease, temporarily — was approved more than a decade ago.

(…)

Alzheimer’s is a formidable foe for a number of reasons. The brain isn’t easy to access, and much about how it works remains mysterious, even as scientific knowledge has moved forward. Doctors can’t take easy, repeat biopsies to see whether a drug is working.

Trials are long and expensive. It has become increasingly clear that it is necessary to treat patients early in the disease, and then wait to see if the disease is prevented or slowed.

Patients, though they are affected in heartbreaking ways, typically are unable to act as advocates for more funding or research when they are in the throes of the disease — unlike cancer or AIDS patients.

Does extra virgin olive oil prevent Alzheimer’s disease?

12 Jan

Sound too good to be true? It probably is. Here is a post on the topic by Joy Victory:

To deconstruct how this went off the rails, let’s start with the university news release sent to journalists: “Temple study: Extra-virgin olive oil preserves memory & protects brain against Alzheimer’s.”

That’s a headline that surely got journalists’ attention. It’s not until after two very long opening paragraphs extolling the virtues of the nearly magical powers of extra virgin olive oil that we find out who, exactly this was tested on.

Mice.

Andrew Gelman gives his take:

I looked briefly at the published research article and am concerned about forking paths, type M errors, and type S errors. Put briefly, I doubt such strong results would show up in a replication of this study.

Psychology podcast on children’s imaginary friends

10 Jan

An InExact Science is a podcast sponsored by the Association for Psychological Science. I just listened to this episode about children’s imaginary friends and I highly recommend it.

How good are you at estimating the passage of time?

5 Jan

I found this pretty interesting. Some researchers have suggested that the ability to count inhales and exhales might be a good measure of mindfulness.

[Hap tip to BoingBoing]

Is Alzheimer’s caused by brain atherosclerosis?

3 Jan

Please  understand that this explanation if one of a number of competing hypotheses. Dr. Greger makes his case here:

%d bloggers like this: