The objective of this work is to develop methods for detecting outliers in time series data. Such methods can become the key component of various monitoring and alerting systems, where an outlier may be equal to some adverse condition that needs human attention. However, real-world time series are often affected by various sources of variability present in the environment that may influence the quality of detection; they may (1) explain some of the changes in the signal that would otherwise lead to false positive detections, as well as, (2) reduce the sensitivity of the detection algorithm leading to increase in false negatives. To alleviate these problems, we propose a new two-layer outlier detection approach that first tries to model and account for the nonstationarity and periodic variation in the time series, and then tries to use other observable variables in the environment to explain any additional signal variation. Our experiments on several data sets in different domains show that our method provides more accurate modeling of the time series, and that it is able to significantly improve outlier detection performance.
In statistics, a outlier is defined as a observation which stands far away from the most of other observations. Often a outlier is present due to the measurements error. Therefore, one of the most important task in data analysis is to identify and (if is necessary) to remove the outliers. There are different methods to detect the outliers, including standard deviation approach and Tukey's method which use interquartile (IQR) range approach. In this post I will use the Tukey's method because I like that it is not dependent on distribution of data.
Will Trump Kill Statistician's Jobs? -- Today Trump met with leaders of pharmaceutical companies, to discuss "astronomical" drug prices and reduce regulations, so that drug companies can still make hefty profits while charging less for drugs. The motivation could be to keep the costs of healthcare down to facilitate the elimination of Obamacare. But how do you achieve such a goal? Someone somewhere has to be the loser in that game. Tutorial: Neutralizing Outliers in Any Dimension -- In this article, we discuss a general framework to drastically reduce the influence of outliers in most contexts.
Handle the outliers is biggest and challengeable task in Machine learning. An outlier is a data set that is distant from all other observations. A data points that lies outside the overall distribution of the dataset. Now, let understand with the help of example…. So, in salary column all employee's salaries fall under this range.
Sports are supposed to be zero sum. There are 32 NFL teams, and 31 of them--that's 97 percent, Falcons fans--finish each year without the pleasure of sticking a big, fat trophy in Roger Goodell's face. The Patriots, who've won five Super Bowls in the past 15 years, are not normal. The success of Tom Brady and Bill Belichick and their rotating cast of skill-position players and pass rushers and defensive backs is a crazy outlier. New England's victory on Sunday night--one in which they overcame a 25-point deficit; the largest previous Super Bowl comeback was 10 points--was an outlier among outliers.