Tài liệu Data Preparation for Data Mining- P15 doc

... whole reason for using the best data preparation available—is that data preparation adds value to the business objective that the miner is addressing. 12.1 Modeling Data Before examining ... map for the CREDIT data set in Figure 11.31 that carries useful information. In spite of the apparent perfect predictions possible from the information enfolded in this da...

Ngày tải lên: 15/12/2013, 13:15

... Series Data Series data differs from the forms of data so far discussed mainly in the way in which the data enfolds the information. The main difference is that the ordering of the data ... Preparing series data for modeling, then, must preserve the nature of the pattern that exists. Preparation also includes putting the data into a form in which the desired inform...

Ngày tải lên: 15/12/2013, 13:15

... extracting information from noisy or distorted series data. They have involved extracting a variety of waveforms from the original waveform that emphasize particular aspects of the data useful for modeling. ... transform accomplishes this. The second transform subtracts the mean of the transformed variable from each transformed value, and divides the result by the standard deviation....

Ngày tải lên: 15/12/2013, 13:15

... of the survey, rather than data preparation? Data preparation concentrates on transforming and adjusting variables’ values to ensure maximum information exposure. Data surveying concentrates ... density manifold stability. But here is where data preparation steps into the data survey. The data survey (Chapter 11) examines the data set as a whole from many differe...

Ngày tải lên: 15/12/2013, 13:15

... that, as a rule of thumb for the minimum amount of data to accept, for mining (as opposed to data preparation) , use at least twice the number of instances required for a data preparation representative ... a mining tool.” “Information is contained in variability.” Information, information, information. Clearly, “information” is a key feature of data preparation. In fact,...

Ngày tải lên: 15/12/2013, 13:15

... variability of a data set is captured, entropic analysis forms the main tool for surveying data. The other tools are useful, but used largely for exploring only where entropic or information analysis ... of the instances can be assembled into a data set, and that data set examined for similarity to the training data set, but that only tells you that the data set now assemb...

Ngày tải lên: 15/12/2013, 13:15

... out faster, which is the technical purpose of data preparation. How does data preparation make the data easier to work with? Essentially, data preparation removes many of the problems. This ... unprepared data shows an 81.8182% accuracy on the test data set (top) and an 85.8283% accuracy in the test data for the prepared data set (bottom). 12.4 Practical Use of...

Ngày tải lên: 15/12/2013, 13:15

... mining tools and data modeling tools focus. The near future will see the development of automated data preparation tools for series data. Approaches for automated series data preparation ... near future for data preparation includes fully automated information exposure for the types of data discussed in this book, including series data, and adding thematic,...

Ngày tải lên: 15/12/2013, 13:15

... The stages of data preparation and what needs to be decided at each stage The fundamental purpose of data preparation is to manipulate and transform raw data so that the information content ... of data and the data set, and various ways of structuring data in order to work with it. Problems that afflict the data and the data set (and also the miner!) were intr...

Ngày tải lên: 24/10/2013, 19:15

... Surveying the data 8. Modeling the data 3.3.1 Stage 1: Accessing the Data The starting point for any data preparation project is to locate the data. This is sometimes ... considered alone. Data Set /Data Survey Issue: Well- and Ill-Formed Manifolds This is really the first data survey step as well as the last data preparat...

Ngày tải lên: 24/10/2013, 19:15