Download Data Mining with R: Learning with Case Studies (Chapman & by Luis Torgo PDF

By Luis Torgo

ISBN-10: 1439810184

ISBN-13: 9781439810187

The flexible services and big set of add-on programs make R a good substitute to many present and sometimes pricey info mining instruments. Exploring this region from the point of view of a practitioner, Data Mining with R: studying with Case Studies makes use of useful examples to demonstrate the facility of R and knowledge mining.

Assuming no past wisdom of R or information mining/statistical options, the publication covers a various set of difficulties that pose assorted demanding situations when it comes to dimension, kind of information, objectives of research, and analytical instruments. to offer the most info mining approaches and methods, the writer takes a hands-on process that makes use of a sequence of special, real-world case studies:
<OL>
* Predicting algae blooms
* Predicting inventory industry returns
* Detecting fraudulent transactions
* Classifying microarray samples
</OL>
With those case reviews, the writer provides all worthwhile steps, code, and data.

Web Resource
A aiding web site mirrors the do-it-yourself procedure of the textual content. It deals a suite of freely to be had R resource records that surround all of the code utilized in the case reports. the positioning additionally offers the knowledge units from the case stories in addition to an R package deal of numerous functions.

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Additional resources for Data Mining with R: Learning with Case Studies (Chapman & Hall/CRC Data Mining and Knowledge Discovery Series)

Example text

925 Max. 600 a7 Min. 400 Max. 7 For instance, we can observe that there are more water samples collected in winter than in the other seasons. For numeric variables, R gives us a series of statistics like their mean, median, quartiles information and extreme values. These statistics provide a first idea of the distribution of the variable values (we return to this issue later on). In the event of a variable having some unknown values, their number is also shown following the string NAs. By observing the difference between medians and means, as well as the inter-quartile range (3rd quartile minus the 1st quartile),8 we can get an idea of the skewness of the distribution and also its spread.

The second example presents the elements of x that are both greater than 40 and less than 100. R also allows you to use a vector of integers to extract several elements from a vector. The numbers in the vector of indexes indicate the positions in the original vector to be extracted: > x[c(4, 6)] [1] -1 90 > x[1:3] [1] 0 -3 4 > y <- c(1, 4) > x[y] [1] 0 -1 15 There are also other operators, && and ||, to perform these operations. These alternatives evaluate expressions from left to right, examining only the first element of the vectors, while the single character versions work element-wise.

18 To check the existence of that function, it is sufficient to type its name at the prompt: > se Error: Object "se" not found The error printed by R indicates that we are safe to use that name. If a function (or any other object) existed with the name “se”, R would have printed its content instead of the error. 10310 If we need to execute several instructions to implement a function, like we did for the function se(), we need to have a form of telling R when the function body starts and when it ends.

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Data Mining with R: Learning with Case Studies (Chapman & Hall/CRC Data Mining and Knowledge Discovery Series) by Luis Torgo


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