Semi supervised Combined computer and human inspection Detect suspicious values

Semi supervised combined computer and human

This preview shows page 11 - 15 out of 15 pages.

Semi-supervised : Combined computer and human inspection Detect suspicious values and check by human (e.g., deal with possible outliers)
Image of page 11

Subscribe to view the full document.

Data Mining Data Preprocessing 1 Data Cleaning as A Process 12 We have looked at techniques for handling missing data and for smoothing data. “But data cleaning is a big job. What about data cleaning as a process? How exactly does one proceed in tackling this task? Are there any tools out there to help?”
Image of page 12
Data Mining Data Preprocessing 1 Data Cleaning as A Process 13 Data discrepancy detection Use metadata (e.g., domain, range, dependency, distribution) Check field overloading Check uniqueness rule , consecutive rule and null rule Use commercial tools Data scrubbing : use simple domain knowledge (e.g., postal code, spell-check) to detect errors and make corrections Data auditing : by analyzing data to discover rules and relationship to detect violators (e.g., correlation and clustering to find outliers)
Image of page 13

Subscribe to view the full document.

Data Mining Data Preprocessing 1 Data Cleaning as A Process 14 Data migration and integration ( transformation ) Data migration tools : allow transformations to be specified ETL (Extraction/Transformation/Loading) tools : allow users to specify transformations through a graphical user interface Integration of the two processes: discrepancy detection & data transformation Iterative and interactive (e.g., Potter’s Wheels )
Image of page 14
Data Mining Data Preprocessing 1 Questions 15 Next time: Data Preprocessing 2 Reading: Han Ch. 3
Image of page 15
  • Winter '18
  • nour

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask You can ask ( soon) You can ask (will expire )
Answers in as fast as 15 minutes