In a recent post, I said that 30 was the rule of thumb, i.e., 30 cases was the minimum needed in a group to be able to run inferential statistics and get meaningful results. How do I know, a colleague asked? (Specifically, “Would you say more about how it takes approximately 30 cases to get meaningful results, or a good place to find out more about that?”) When I was in graduate school, a classmate (who was into theoretical mathematics) showed me the mathematical formula for this rule of thumb. Of course I don’t remember the formula, only the result. So I went looking for the explanation. I found this site. Although my classmate did go into the details of the chi-square distribution and the formula computations, this article doesn’t do that. It even provides an Excel Demo for calculating sample size and verifying this rule of thumb. I am so relieved that there is another source besides my memory.
I will be attending the 15th annual Engagement Scholarship Consortium meeting this fall. I’ve submitted a poster, titled Is blogging just outreach? Can blogs also engage? My contention is that reading is a form of engagement and analytics will support that. I am gathering support from my readers and their comments. Two comments are posted below.
“Blogging provides two distinct benefits, engages the reader with new content, but also expands on the sites cyber footprint, thus increasing CTR and Impressions in the search engines.”
“I would say blogs that have regular readers and are engaged with commenting are definitely making a difference.”
These are different takes on engagement from what passes for engagement, where it is assumed that the “target audience” is engaged when the target audience is contributing. An evaluation colleague calls this “doing as”. Extension has always been about the process of “doing to”; lately (in the last 15 years or so), Extension has moved into the arena of “doing with” . When Extension consistently implements a program “doing as”, outreach and engagement will be the norm. What do you think, reader–are blogs a form of engagement?
My two cents.