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Modelling S shaped hazard function: A case of evaluating Volvo Cars training project
Högskolan Dalarna, Akademin Industri och samhälle, Mikrodataanalys.
2014 (Engelska)Självständigt arbete på avancerad nivå (masterexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
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.

Ort, förlag, år, upplaga, sidor
2014.
Nyckelord [en]
Shape restricted hazard function, Duration data, Length of
Nationell ämneskategori
Övrig annan teknik
Identifikatorer
URN: urn:nbn:se:du-14720OAI: oai:DiVA.org:du-14720DiVA, id: diva2:735823
Tillgänglig från: 2014-08-01 Skapad: 2014-08-01 Senast uppdaterad: 2014-08-01Bibliografiskt granskad

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