I came across a really interesting paper recently after seeing it referred to in a news story: Female teachers’ math anxiety affects girls’ math achievement (Beilock et al., 2010, PNAS, with Supplemental information)
The researchers recruited 17 first- and second-grade teachers (all female) and assessed the math achievement of the students in their classrooms at the [...]
Posts under ‘analysis’
supplemental statistics
large datasets and threats to validity
I just read “Limits of Predictability in Human Mobility” by Chaoming Song, et al. (Science, Vol. 327, 2010). The paper reports an analysis of a really amazing dataset: three months of cell phone records for ~10 million customers of a large European carrier (“anonymized by the data source”). These records include information about the cell [...]
beyond significance testing
I’ve been reading a book lately before bed, a little bit at a time: Beyond Significance Testing, by Rex B. Kline. It isn’t exactly a suspenseful page-turner; maybe if I tried reading it some other time of day than when I am already sleepy I might be able to get through it faster.
The purpose of [...]
hierarchies and semantics
In my dissertation experiment, I asked ~60 people from two different graduate schools (or “communities”) on campus to label and organize a set of short documents into a hierarchy (tree structure). They used a web-based interface created specifically for the experiment, that closely resembled the file-and-folder metaphor everybody is used to in Microsoft Windows and [...]
more fun with MDS (and R)
i’ve spent the past few hours futzing (yes, futzing) with some more MDS plots of the document (file) grouping data from my dissertation experiment, visualized this time by document rather than by person. each participant in the experiment organized the same 33 documents into a file-and-folder hierarchy. i chose the documents (document excerpts, really) from [...]
