Proceedings of the Postgraduate Annual Research Seminar 2005
23
Outlier Detection Technique in Data Mining: A Research Perspective
1
M. O. Mansur,
2
Mohd. Noor Md. Sap
Faculty of Computer Science and Information Systems Universiti Teknologi Malaysia
1 2
mansurukm4@gmail.com,
...
collect the data
Cleaning Data: Check for mistakes and anomalies by:
Undertaking frequency plots:
Reveals data outside of expected range
e.g., outliers
Reveals data with impossible values
e.g., gender coded as: 1 = male; 2 = female thus 3 = data entry error
Re-enter a set of data randomly
Allows...
a linear regression analysis, the following assumptions must be met: a linear relationship is present between the two variables and no significant outliers or influential points are present. This can be test with a scatterplot. (Figure 1) Although a relation is present, it is not linear. Instead it reflects...
e. Determine if there are any outliers within the data set. Ifthere is an outlier, state its value(s).
f. Find the z score of each outlier if any exists and interpret theirrelativeposition in terms of standard deviations.
g. Explain what effect an outlier, if any exists, has on the mean...
such as out-of-range values.
(b) check for missing values, and deciding how to deal with the missing values.
(c) check for outliers, and deciding how to deal with outliers.
(d) check for normality, and deciding how to deal with non-normality.
1. Finding incorrectly entered data
▪ Your first...
data errors but not irrelevant objects. To reduce both types of noise there are three traditional outlier detection techniques distance-based, clustering-based, and an approach based on the Local Outlier Factor (LOF) of an object. In this paper we introduce a new method for noise reduction using polynomial...
student is studying a double or single degree, the results from the weekly quiz’s and the grade achieved on the mid semester report. The presence of outliers will be determined to help analyse the accuracy of the data. There are an infinite number of internal and external factors that contribute to the...
Tarif AlHinnawi
ID#9066330
Outliers Review
Outliers The Story of Success is a nonfiction book written by Malcolm Gladwell which examines the factors that stand behind and contribute to high level of success of different individuals. Outliers, which Gladwell wrote in 2008 after the huge success of...
Outlier Essay: Martin Luther King Jr.
An outlier is a person or thing situated away or detached from the main body or system. In other words, an outlier is somebody who goes out of his or her way and does something extraordinary in order to accomplish their goal. Martin Luther King Jr. is a true example...
Confidence Interval
Part 2 Box Plot Analysis
First, we grouped the data to 4 parts, Jan, Feb, March and April. Then we analyzed each group’s outliers and did the box plot. Then we combined all the groups and did box plot analysis.
1) Group 1 --- January
Mean: -0.00243 Median: -0.00437
Q1:...
variability, association between two variables, as well as using data for exploratory analysis and the shape, relative location, and the identification of outliers. The data presented offers a look at four data sets including opening gross income, total gross income, number of theaters, and weeks in the top...
standard deviation and interquartile range for these data.
Do these data contain an outlier? If so, drop the outlier and recalculate all the measures. Which of these measures changes by a larger amount when you drop the outlier?
Which is the better measure of center for these data, the mean or the median...
reform) on the real exchange rate, using outlier methodology. We also show that there is no tendency to the purchasing power parity in China to hold in the long run during this period. Keywords : Purchasing power parity; real exchange rate; unit root tests; outliers; renminbi. JEL Classiﬁcation: C22, F31...
An outlier is a person or thing situated away or detached from the main body or system. In other words, an outlier is a person who goes out of their way and does something no one thought was possible for them to do. Many people in the book Outliers by Malcolm Gladwell did things that people thought weren’t...
October 14, 2013
Outliers Essay
To me, the definition of an outlier goes far beyond just someone that stands out in a crowd or has an extraordinary talent. An outlier is something that is situated away from or classed differently from a main or related body. In the novel Outliers, which was written...
This shows us the outliers very clearly. We have the mild outliers as well as extreme outliers.
Mild outliers are between 23000000 and 29000000. Extreme outliers are between 37000000 and 120000000.
Looking at the data, Chesapeake Energy and Motorala are the major outliers in the higher range of...
shape and outlier
Types of center: mean, median and mode (and their definitions)
Types of variability: range, standard deviation and IQR (and their definitions)
Types of shape: symmetric, skew to the left, skew to the right, unimodal and bimodal (and their definitions)
Definition of outlier (unusual...
moderate budgets while very few movies used up a large amount of money. There is a small rise of frequency on 150,000,000 of budget and there are two outliers around 210,000,000 and one over 240,000,000.
b)
The data consists of pattern, which is lack of fit. The graph has numerous major peaks and bottoms...