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Modelling S shaped hazard function: A case of evaluating Volvo Cars training project
Dalarna University, School of Technology and Business Studies, Microdata Analysis.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The aim of this study is to introduce a new S-shaped hazard function, derive its corre-

sponding likelihood function and then apply it to a real dataset to show advantages of

such method. We dened an inovative S-shaped hazard function based on arctangent

with three additional parameters. Our hazard function opens new possibilities for the

measurement of the lock-in e ect directly using one of its parameters. Its signicance is

further tested by a standard Wald test. We derive a log-likelihood function and apply

it on a data from Volvo Cars Project. According to our results we conclude that the

program was unsuccessful. Surprising shapes of nal hazard functions lead us to closer

examination of possible limitations. We conclude that our results could be a ected

by several aspects such as data quality, computational methods and possible violation

of independency assumption. Nevertheless, this study works as a useful summary of

the newly-dened S-shaped hazard function and highlights its innovative possibility to

estimate lock-in e ect together with its signicance testing.

Place, publisher, year, edition, pages
2014.
Keyword [en]
Shape restricted hazard function, Duration data, Length of
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
URN: urn:nbn:se:du-14720OAI: oai:DiVA.org:du-14720DiVA: diva2:735823
Available from: 2014-08-01 Created: 2014-08-01 Last updated: 2014-08-01Bibliographically approved

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