The sixth Zac Power Special Files book, containing two classic Zac stories! In Mind Games, Zac races through Bladesville to catch a gang of super-smart hackers. Then in Fossil Fury, he goes up against a crazy scientist who says he's brought a dinosaur back to life. Can Zac take on Bladesville - and win?

An encyclopedia designed especially to meet the needs of elementary, junior high, and senior high school students.

Statistical Computation for Programmers, Scientists, Quants, Excel Users, and Other Professionals Using the open source R language, you can build powerful statistical models to answer many of your most challenging questions. R has traditionally been difficult for non-statisticians to learn, and most R books assume far too much knowledge to be of help. R for Everyone, Second Edition, is the solution. Drawing on his unsurpassed experience teaching new users, professional data scientist Jared P. Lander has written the perfect tutorial for anyone new to statistical programming and modeling. Organized to make learning easy and intuitive, this guide focuses on the 20 percent of R functionality you’ll need to accomplish 80 percent of modern data tasks. Lander’s self-contained chapters start with the absolute basics, offering extensive hands-on practice and sample code. You’ll download and install R; navigate and use the R environment; master basic program control, data import, manipulation, and visualization; and walk through several essential tests. Then, building on this foundation, you’ll construct several complete models, both linear and nonlinear, and use some data mining techniques. After all this you’ll make your code reproducible with LaTeX, RMarkdown, and Shiny. By the time you’re done, you won’t just know how to write R programs, you’ll be ready to tackle the statistical problems you care about most. Coverage includes Explore R, RStudio, and R packages Use R for math: variable types, vectors, calling functions, and more Exploit data structures, including data.frames, matrices, and lists Read many different types of data Create attractive, intuitive statistical graphics Write user-defined functions Control program flow with if, ifelse, and complex checks Improve program efficiency with group manipulations Combine and reshape multiple datasets Manipulate strings using R’s facilities and regular expressions Create normal, binomial, and Poisson probability distributions Build linear, generalized linear, and nonlinear models Program basic statistics: mean, standard deviation, and t-tests Train machine learning models Assess the quality of models and variable selection Prevent overfitting and perform variable selection, using the Elastic Net and Bayesian methods Analyze univariate and multivariate time series data Group data via K-means and hierarchical clustering Prepare reports, slideshows, and web pages with knitr Display interactive data with RMarkdown and htmlwidgets Implement dashboards with Shiny Build reusable R packages with devtools and Rcpp Register your product at informit.com/register for convenient access to downloads, updates, and corrections as they become available.

Book 5 in the bestselling Phoenix Files series. The time for pretending is over. The Shackleton Building has been turned into a concentration camp, and the last free people in Phoenix are forced into hiding. The fght is over unless Jordan and Luke can fgure out where the Co-operative is hiding Tobias. And Jordan has to fnd a way to protect Luke before Peter rages out of control ... or else history is doomed to repeat itself. With only weeks left until Tabitha is released, Phoenix's biggest secrets are yet to be revealed. And the clock is still ticking. There are 35 days until the end of the world.

Luke is having a rough year. When his parents split up, his mum drags him to Phoenix, a brand-new town in the middle of nowhere. But Phoenix is no ordinary town. There are no cars, no phones and no internet. Then he discovers that someone is plotting to wipe out the human race. Phoenix is suddenly the safest and most dangerous place on earth. And the clock is already ticking.

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