Time-Series Intervention Analysis Using ITSACORR: Fatal Flaws

The ITSACORR method (Crosbie, 1993, 1995) is evaluated for the analysis of two-phase interrupted time-series designs. It is shown that each component of the ITSACORR framework (including the structural model, the design matrix, the autocorrelation estimator, the ultimate parameter estimation scheme, and the inferential method) contains fatal flaws

Differing Air Traffic Controller Responses to Similar Trajectory Prediction Errors: An Interrupted Time-Series Analysis of Controller Behavior

A Human-In-The-Loop simulation was conducted in January of 2013 in the Airspace Operations Laboratory at NASAs Ames Research Center. The simulation airspace included two en route sectors feeding the northwest corner of Atlantas Terminal Radar Approach Control. The focus of this paper is on how uncertainties in the studys trajectory predictions impacted the controllers ability to perform their duties. Of particular interest is how the controllers interacted with the delay information displayed in the meter list and data block while managing the arrival flows. Due to wind forecasts with 20-knot over-predictions and 20-knot under-predictions, delay value computations included errors of similar magnitude, albeit in opposite directions. However, when performing their duties in the presence of these errors, did the controllers issue clearances of similar magnitude, albeit in opposite directions

Implications of customer and entrepreneurial orientations for SME growth

PURPOSE. The aim of this paper is to empirically investigate how the business orientations of customer orientation (CO) (represented by responsiveness to customers) and entrepreneurial orientation (EO) (represented by proactiveness, innovativeness and risk‐taking) impact the growth of SMEs. DESIGN/METHODOLOGY/APPROACH. This study uses a quantitative empirical approach, using structural equation modeling with the software package AMOS to analyze the results of 660 surveyed SMEs from Austria. FINDINGS. This analysis reveals that EO is positively related to SME growth but CO shows a negative association with growth. Moreover, this analysis suggests that SMEs grow the most if they exhibit high EO and low CO. RESEARCH LIMITATIONS/IMPLICATIONS. This analysis shows that CO, interpreted as a purely responsive and reactive construct, cannot be considered a strategy that leads to sustainable SME growth. If an SME desires growth, EO is needed to fuel these growth aspirations. In spite of these findings however, this study shows that SMEs tend to respond to a scarcity of financial resources with more CO and less EO, which then leads to less or even negative growth. PRACTICAL IMPLICATIONS. Sustainable firm growth seems impossible without an EO. However, this does not mean that CO is not of any value for SMEs. Being non‐entrepreneurially oriented does not mean that a firm is automatically customer oriented. So, it is not only about implementing CO or EO since there is still the third option: implementing neither. ORIGINALITY/VALUE. This paper contributes to the ongoing scholarly conversation on the value of different orientations to firms and takes the view that the conversation on CO and EO has mis‐specified business performance in seeking to understand their performance consequences. By looking at firm growth, relevant to the longer‐term performance of a firm, EO might drive growth because of its emphasis on innovation to renew the firm's growth trajectory whereas CO might stifle growth owing to its myopic focus. Thus, this study addresses calls in the business and entrepreneurship literatures to more fully understand how SMEs can capture value from their customer and entrepreneurial orientations

Differing air traffic controller responses to similar trajectory prediction errors: An interrupted time-series analysis of controller behavior

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The effects of behavioral history on response acquisition with immediate and delayed reinforcement.

Effects of prior exposure to the experimental chamber with levers present or absent and variable-time (VT) 60-s water deliveries arranged during one, five, or no 1-hr sessions were examined in rats during a 6-hr response-acquisition session in which presses on one lever produced water delivery immediately or after a 15-s resetting delay, and presses on the other lever canceled scheduled water deliveries. Response acquisition was (a) slower to occur when water deliveries were delayed, (b) most consistent in groups that had received five VT sessions, and (c) impaired by the presence of levers only when there had been five VT sessions and water deliveries were delayed during the acquisition session