Thought of the Day — George Pólya

Examine your guess. Your guess may be right, but it is foolish to accept a vivid guess as a proven truth — as primitive people often do. Your guess may be wrong. But it is also foolish to disregard a vivid guess altogether — as pedantic people sometimes do. Guesses of a certain kind deserve to be examined and taken seriously: those which occur to us after we have attentively considered and really understood a problem in which we are genuinely interested. Such guesses usually contain at least a fragment of the truth although, of course, they very seldom show the whole truth. Yet there is a chance to extract the whole truth if we examine such a guess appropriately.

Many a guess has turned out to be wrong but nevertheless useful in leading to a better one.

No idea is really bad, unless we are uncritical. What is really bad is to have no idea at all.

From: Observational Epidemiology

Quote of the Day — Alan Sokol

“If the texts seem incomprehensible, it is for the excellent reason that they mean precisely nothing.”

Moderator and mediator effects

Source: Frazier, P. A., Tix, A. P., & Barron, K. E. (2004). Testing moderator and mediator effects in counseling psychology research. Journal of Counseling Psychology, 51(1), 115-134. doi:10.1037/0022-0167.51.1.115

Survey bias – another perspective

Source: Page, L. A., & Henderson, M. (2008). Appraising the evidence: What is measurement bias? Evidence Based Mental Health, 11(2), 36-37. doi:10.1136/ebmh.11.2.36

Survey error taxonomy

Source: Bethlehem, J. (in press). Selection bias in web surveys. International Statistical Review. doi:10.1111/j.1751-5823.2010.00112.x

Statistics Resources for Social and Behavioural Sciences: SPSS, R, Maths, and Writing

Here is a newly discovered blog with lots of useful articles about practical statistics.


From: Jeromy Anglim’s Blog: Psychology and Statistics

Digital Research Tools Wiki


This wiki collects information about tools and resources that can help scholars (particularly in the humanities and social sciences) conduct research more efficiently or creatively. Whether you need software to help you manage citations, author a multimedia work, or analyze texts, Digital Research Tools will help you find what you’re looking for. We provide a directory of tools organized by research activity, as well as reviews of select tools in which we not only describe the tool’s features, but also explore how it might be employed most effectively by researchers.

Where to Find a Librarian 24/7

Where to Find a Librarian 24/7 |

If you ever have any research trouble, you should seriously consider contacting a librarian.

They can cut your research time in half – and help you find exactly what you need.

And you never need to visit a library to talk with them.

Directory of Open Access Journals

Directory of open access journals

Welcome to the Directory of Open Access Journals. This service covers free, full text, quality controlled scientific and scholarly journals. We aim to cover all subjects and languages. There are now 3145 journals in the directory. Currently 1014 journals are searchable at article level. As of today 172243 articles are included in the DOAJ service.

Virtual Reference Training

ORE Ohio Reference Excellence on the Web, web based training for Reference Service from Ohio Library Council

OLC provides Ohio Reference Excellence on the Web to increase access to ORE training and improve the quality of reference service in Ohio! Six self-paced modules cover the reference process, with resource links, exercises, and quizzes.

MIT Lecture Browser

MIT Lecture Browser

This site provides free access to a searchable database of lectures
from MIT departments. These cover all subject areas of the arts,
humanities, sciences and social sciences providing free access to audio
and video recordings of academic lectures along with transcripts of the
content. details on technical and copyright information is provided on
the website.

LibrarySpot Encyclopedias, maps, online libraries, quotations, dictionaries & more.

LibrarySpot is a free virtual library resource center for educators and students, librarians and their patrons, families, businesses and just about anyone exploring the Web for valuable research information.


Intute: Social Sciences – Full record details for 2collab

2collab is a free social bookmarking site from publisher Elsevier. It aims to encourage academic researchers to create and share bookmarks of key internet resources (articles, journals, web resources) in private or public groups. Registration is required to use all the web 2.0 features. However it is possible to search the bookmarks without registration. There is a blog which alerts to new features on the website.

The Difference Between Correlation and Causality

Foundation Series: The Difference Between Correlation and Causality | Tyner Blain

One of the most common mistakes people make when looking at data is to jump to conclusions about the data. We all live in a world of cause and effect. It is only natural that when we see data that appears to show cause and effect, we assume that it does. But it often doesn’t. This article shows the difference between cause and effect relationships and correlated data.

The Self-Directed Student Toolbox: 100 Web Resources for Lifelong Learners

The Self-Directed Student Toolbox: 100 Web Resources for Lifelong Learners | OEDb

Lifelong learning means that individuals can have access to and are willing to participate in ongoing, not recurrent, education. This “learning to learn” philosophy can begin with toddlers and it can extend throughout a person’s life with branches that can extend into various experiences and careers. Since lifelong learning has become a prerogative for many organizations, it would be impossible to list them all here. Instead, we’ve chosen the best resources for adult learners in ten categories to develop a self-directed toolbox that can lead you, the lifelong learner, to other resources that you may need to meet personal goals.

Beyond Wikipedia: 20 References You Can’t Do Without

Beyond Wikipedia: 20 References You Can’t Do Without | Student Productivity At Its Finest

You may not know this, but there are actually a number of great references available to you that isn’t Wikipedia. Now, don’t get me wrong – I love Wikipedia, too. Whenever I first begin a project I almost always go and overview it through Wikipedia. It’s a great introduction to a subject, also connecting you easily to other related ideas, people and places.

But it’s not all you have. Now, put aside the enormous amount of electronic resources your school gives you access to that you never use, this is mostly resources anyone can use (with a couple of notable exceptions). Some even make use of Wikipedia, though not in the usual way. We’ll start with general resources, and then get down to the resources available to a few specific disciplines.

Online electronic journals index

eprintweb – Home is an e-print service in the fields of physics, mathematics, non-linear science, computer science, and quantitative biology, and consists of e-print records which can be browsed and searched.

The contents of are provided by arXiv, which is operated and funded by Cornell University Library, a private not-for-profit educational institution, and is also partially funded by the National Science Foundation.

Virtual Learning Resources Center

Virtual Learning Resources Center

The mission of the Virtual Learning Resources Center is to index thousands of the best academic information websites, selected by teachers and library professionals worldwide, in order to provide to students and teachers current, valid information for school and university academic projects.

It has a meta-search engine that includes in its results information gleaned from many of the best research portals including : Librarians’ Index to the Internet, Galaxy Web Directory, My Virtual Reference Desk, Big Hub, Internet Public Library, Bibliomania, BUBL Information Service, Digital Librarian, Discovery School, Smithsonian, Suite101,, the LibrarySpot, the Awesome Library, and an increasing number of university and public library Internet subject guides.

The Best Online Research Apps/Sites You’ve Never Heard Of

The Best Online Research Apps/Sites You’ve Never Heard Of | OEDb

Research can be a time consuming and sometimes tedious task. How can you make it easier for yourself? While there is no complete substitute for a good old-fashioned trip to the library, you can find a wide variety of information with many research tools. Here are a few sites listed in alphabetical order. You might not be familiar with some of the resources, but they can help supplement and improve your research.

Which search engine when?

Phil Bradley: Finding what you need with the best search engines

Search engines that help you find whatever you are looking for. This is a collection of helpful resources to assist you in finding information.