Author Archives: Lucas Allen

Win a Classroom Set of TI-Nspire CX’s with a Selfie

miss mayim selfie ti

Texas Instruments often does a cool back to school promotions, and they’ve got a great one this year. They are offering participants the chance to win a set of 30 TI-Nspire CX (or TI-84 Plus C) graphing calculators by having the best selfie. Contestants, who just have to be 13 years or older, need to post a picture of themselves using their favorite TI technology to Instagram or Twitter with the hashtag #TISelfieContest. The grand prize winner gets a set of graphing calculators as well as teacher software, and a video conference with TI spokesperson and star of The Big Bang Theory, Mayim Bialik.

To learn more, head on over to, where Texas Instruments has complete rules posted as well as full detail on that grand prize and the 5 runner up prizes (a single TI-Nspire CX or TI-84 Plus C). Hurry, contest ends Sept. 21, 2014.

Regression Models Coursera Review

The seventh course in Johns Hopkins Data Science Specialization on Coursera is Regression Models. This is the second course in the sequence taught by Brian Caffo, after Statistical Inference. Much like that course, the emphasis here is on mathematics, and people who have been out of the mathematical loop for a while will probably find thisContinue Reading

Statistical Inference Coursera Review

The sixth course in Johns Hopkins Data Science Specialization on Coursera is Statistical Inference. This is the first course in the specialization taught by Brian Caffo. In my review of the R Programming course, I mentioned that there were two places in the sequence that seemed (based solely on my observations of forum comments) to be boggingContinue Reading

Reproducible Research Coursera Review

The fifth course in Johns Hopkins Data Science Specialization on Coursera is Reproducible Research. This is the third and final course in the sequence taught by Roger Peng. Reproducible Research is the course among the first five in the specialization (except The Data Scientist’s Toolbox), where I spent the least time learning new R code. Instead, theContinue Reading

Exploratory Data Analysis Coursera Review

The fourth course in Johns Hopkins Data Science Specialization on Coursera is Exploratory Data Analysis. This is the second class in the sequence taught by Roger Peng, after R programming. This course could just about as well be titled “Visualizing Data,” since most everything in the class emphasized methods of presenting data visually in R. The bulk ofContinue Reading

Getting and Cleaning Data Coursera Review

The third course in Johns Hopkins Data Science specialization on Coursera is Getting and Cleaning Data. The purpose of this class is to get students familiar with the process of creating a “tidy” data set from a variety of different sources. Like The Data Scientist’s Toolbox, this class is taught by Jeff Leek. The breadth of material coveredContinue Reading

R Programming Coursera Review

The second course in Johns Hopkins Data Science Specialization on Coursera is R Programming. I took this class concurrently with The Data Scientist’s Toolbox, which was more of a “warm up” class. If you don’t have much of a programming background, you’d better get warm quickly, because this class gets hot in a hurry for theContinue Reading

Second Editions of TI-Nspire Tutorials

Second Editions of TI-Nspire Tutorials

With my long silence here on Tech Powered Math, I’ve hardly mentioned the fact that there have been two upgrades to the TI-Nspire operating system, OS 3.6 and OS 3.9. These upgrades have been incremental, not earth shattering, but they have pleasantly changed some aesthetics throughout the TI-Nspire environment. There have also been some minorContinue Reading