Psychiatry Research and Statistics
Ron Wright -- email: wrightr at u.arizona.edu
University of Arizona, Department of Psychiatry

Readings, Handouts, Homework, and Answers

11/6/09

Handout for 11/6/09.

11/13/09

Handout for 11/13/09. -- I'll get this to you in a day or so and email you a copy.

11/20/09

Kr06A, Kraemer and Kupfer, Size of Treatment Effects - RCTs.pdf

Seeing Statistics A helpful web site for learning more about statistics: I'll show you some of this.

Home page: www.seeingstatistics.com -- It looks like you need a password, but for now you don't.

Sites relavent to current material (specifically binomal distribution):

Binomial Calculator -- Shows the binomial histogram and allows you to calculate probabilities.
Binomial Quantile Calculator -- Shows the binomial histogram and allows you to calculate probabilities.
Binomial Histograms Empirically - Coin Flips Samples -- Flipping a coin is a simple binomial trial. You can see her how the empirical distribution approaches the theoretical distribution if you do the experiment a few thousand times.
Applet Gallery -- The complete list of all the Seeing Statistics Applets.

Sample interesting pages include:

Throwing two dice -- compare the observed distribution with the theoretical distribution
The normal distribution (bell curve) -- get a feeling for the distribution.
In "summarizing a set of numbers, the mean minimizes squared error
In "summarizing a set of numbers, the median minimizes absolute error
In "summarizing a relationship between two variables, the least-squares regression line minimizes squared error

Thinking your way through a study - We did part of this in the spring of 2009.: Thinking Through a Research Study -- Sample answers; Thinking Through a Research Study -- Blank form
Some Thoughts about Research in Psychiatry