Showing posts with label tools. Show all posts
Showing posts with label tools. Show all posts

Beginning J2ME Platform: From Novice to Professional Review

Beginning J2ME Platform: From Novice to Professional
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Beginning J2ME Platform: From Novice to Professional ReviewJ2ME is a jungle of configurations, profiles, and APIs. A beginner's book might soar over the jungle like an exotic bird, pretty but insubstantial. Such a book would see everything from a 20,000 foot view. You'd see the lay of the land, but wouldn't get your feet wet.
Another approach would be for the authors to grab their machetes and start hacking their way in, following a particular path. You'd get all dirty and sweaty and get a lot of experience, but not necessarily understand exactly how you got there.
This book decidedly takes this latter path. After a brief introductory chapter, it concentrates on the core APIs and the most commonly implemented configuration and device profile. Although there's plenty of practical information on tools and lots of code examples, as a reader unfamiliar with J2ME, and someone who doesn't own a Java-enabled phone, I felt disoriented. As an introduction to J2ME programming, I felt the book was lacking in background and motivations.
Striking a balance between the two approaches I described might be a fool's errand. Therefore you would probably need one book from each category to really get involved in J2ME development.Beginning J2ME Platform: From Novice to Professional OverviewJ2ME is a platform for wireless and mobile Java application development. Beginning J2ME makes this and all the fun you can have with it accessible to the first time wireless Java developer as well as useful to the experienced. This book includes coverage such as sound HTTPS support, lots of user interface API enhancements, a Game API, sound/music API, 3D graphics, Bluetooth, and much more. It's easy to read with lots of practical hands-on and able to use code examples.

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Data Manipulation with R (Use R) Review

Data Manipulation with R (Use R)
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Data Manipulation with R (Use R) ReviewThis book along with Jim Albert's should be read by every statistician that does a lot of statistical computing. Both books help you learn R quickly and apply it to many important problems in research both applied and theoretical. Albert emphasizes applications in Bayesian statistics whereas Spector is teaching how to do data manipulation, things like merging and transposing data sets. These techniques can be easy to do in a language like SAS after a little training but in other programming languages it can be very difficult.Data Manipulation with R (Use R) OverviewThis book presents a wide array of methods applicable for reading data into R, and efficiently manipulating that data.In addition to the built-in functions, a number of readily available packages from CRAN (the Comprehensive R Archive Network) are also covered. All of the methods presented take advantage of the core features of R: vectorization, efficient use of subscripting, and the proper use of the varied functions in R that are provided for common data management tasks. Most experienced R users discover that, especially when working with large data sets, it may be helpful to use other programs, notably databases, in conjunction with R. Accordingly, the use of databases in R is covered in detail, along with methods for extracting data from spreadsheets and datasets created by other programs. Character manipulation, while sometimes overlooked within R, is also covered in detail, allowing problems that are traditionally solved by scripting languages to be carried out entirely within R. For users with experience in other languages, guidelines for the effective use of programming constructs like loops are provided. Since many statistical modeling and graphics functions need their data presented in a data frame, techniques for converting the output of commonly used functions to data frames are provided throughout the book.

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The R Book Review

The R Book
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The R Book ReviewThis book is both ponderous and expensive, so my decision to buy it was predicated on the dual claim that it's 'the first comprehensive reference manual for the R language' and `ideal for novice and accomplished user alike'. As an R beginner and non-statistician (with some long-ago training therein) pressed into scientific data analysis on a regular basis, I wanted a comprehensive reference that covers both the R language and theory behind modern applied statistical methods.This is no small undertaking, but Crawley succeeds reasonably well at the task.
The book contains 27 chapters. The first 5 chapters cover subjects like getting started, essentials of the R language, data input, data frames, and graphics. A lot of the information in these chapters is freely available online at CRAN, or may be queried from within R itself. Still, I find it useful to have this info as part of any desktop reference, and most books on R are similarly equipped. I found nothing lacking here.
Chapters 6-8 cover tables, mathematics, and classical tests. In the mathematics chapter, you'll be introduced to a wealth of math and probability functions, as well as the basics of matrix algebra. If your statistical training centered mainly on the basic normal, student's t, Fisher's F, poisson, and chi-square distributions, get ready for an education. The author's presentation of this material is both in-depth and well articulated.
Chapters 9-20 cover statistical modeling, regression, ANOVA, ANCOVA, GLM, count data, count data in tables, proportion data, binary response variables, GAMs, non-linear models, and mixed effects models.Chapters 21-26 address more advanced topics of tree models, time series analysis, spatial statistics, multivariate statistics, survival analysis and simulation. The author's discussion of statistical models, ANOVA, GLM, and mixed effects models (the four chapters I have dug into thus far) covers theory as well as practical application inside R. Chapters are supplemented with worked examples drawn from various R data libraries. The R code used to generate solutions is presented as well, although I found it difficult to integrate because Crawley is using the R console interactively and snippets of code are spread out over many pages. Yes, you can download a data library, type in the code presented in the book, and get the same output. The difficulty arises in making the transition from textbook example to efficient and statistically valid processing of real- world data. If you're new to object oriented programming, this book will not teach you how to program in R. Only practice and good example can do that. I still struggle with some R programming basics and this book did not help at all.

Oddly, the book ends with a final chapter 'Changing the Look of Graphics'. Seems like this should be part of chapter 5 'Graphics'; it's a mystery why this was broken out as a separate chapter and stuck at the end.
The book contains numerous typos that suggest a lack of proofreading. Also annoying is the author's predilection for cross-referencing, such that one is constantly being advised to 'refer to page ...' for more info. Furthermore, the author profanely suggests Word as a text editor (yikes!). There are excellent text editors freely available for R, but Word isn't one of them. I use TINN-R, but there are other options. Also, options for managing R output are given short shrift. I use Notepad++, a tabbed, free text editor which is similar to TINN-R, but external to R. FYI, Notepad++ will also read SAS output in its native format, so one can easily review, compare, and extract information without invoking an R or SAS session.
Be advised, this book has created some controversy within the elite, tight-knit R Core Development group. The book was reviewed in the October 2007 issue of R News, available online (thumbs down). Crawley evidently is not part of the R Core Development 'inner sanctum', so the book's rather grandiose claim as 'the first comprehensive R reference manual' has engendered some criticism from that group. Other criticism about R expressions, the author's advice regarding use of certain R functions, and use of specific R packages may be found therein. Read the review then make your own judgment. As it stands, I don't consider this book to be an authoritative reference on either statistics or the R language, but it does offer an inclusive survey of both. If you already own a good statistics text, are familiar with object oriented programming, and only need a reference explaining how to get started programming in R, you'll save money by buying An Introduction to R by Venables and Smith. Amazon's wallet- friendly price: $13.57. Or you may download a free PDF version from the CRAN website.
I'll give the book four stars. It has some flaws (a second edition would be welcome), but overall constitutes a useful addition to the R literature. As for programming, I'm eagerly awaiting Braun and Murdoch's 'A First Course in Statistical Programming in R'. There are enough books on R-based statistical analysis in the vein of Crawley and others; we need a book that teaches programming and the latter should fill the gap nicely.The R Book Overview

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