Outliers can distort many measures in data analysis and statistical modeling, and influential points can have disproportionate impact on the estimated values of model parameters. Jang and Anderson-Cook (2013) proposed a new set of graphical summaries, called firework plots, as simple tools for evaluating the impact of outliers and influential points in regression. Variations of the plots focus ...

Multivariate outlier detection based on the Mahalanobis distance with the BACON-EEM algorithm, the TRC algorithm and the ER algorithm is presented and imputation of outliers and further missing values is discussed. The methods are illustrated with a data set on Swedish municipalities. The relation between outliers, influential observations and selective editing is explored. Finally robust multi...

Policy makers often look to economic research for guidance. Econometric studies examining actual economic outcomes for countries under different historical policy regimes are particularly valuable. These studies are sometimes performed on small (N ≈ 100) data sets. A particular concern when working with these data sets is the potential for the inference from the regression to be sensitive to a ...

In statistical modelling, it is often important to know how much parameter estimates are influenced by particular observations. An attractive approach is to re-estimate the parameters with each observation deleted in turn, but this is computationally demanding when fitting models by using Markov chain Monte Carlo (MCMC), as obtaining complete sample estimates is often in itself a very time-cons...

Most aeolian sediment transport models and experiments have been conducted on flat horizontal surfaces. Very little numerical or analytical research has been carried out for aeolian sand transport on slopes. The current work presents numerical modelling of saltating sand for a climbing dune which has a slope angle of 20”. The model utilised wind fields predicted from the FAA complex terrain mod...

Flow boiling in a straight\ rectangular channel was investigated to explore the conditions leading to critical heat ~ux "CHF#[ The ~ow channel had a 4[9×1[4 mm cross!section and 090[5 mm heated length^ heat was applied to the shorter dimension along only one wall[ Tests were performed with FC!61 liquid over a velocity range of 9[14 to 09 m s and at outlet subcoolings of 2\ 05 and 18>C[ Video im...

Outliers and influential observations can have an important effect on work with estimation and inference from establishment survey data. Practical development and implementation of methods to identify and account for outliers and influential observations in complex survey data require an agency to balance several factors, including: (i) the mathematical statistics properties of detection method...