TMA4275 Lifetime analysis, autumn 2025

11.12.2024: Please find here the exam text, a solution sketch, as well as evaluation guidelines, that were used in the grading.

01.12.2024: Obs: There is an error in the solution sketch for exam 2021, 7c, on page 10. The distibution of theta-hat should be approximately normal distributed with mean theta and the inverse of the observed information matrix as covariance matrix.

01.12.2024: The front page of your exam problem set is now available here. Please read it carefully - before the exam day.

28.11.2025: Please find here the promised notes for the last lecture (lecture 11) on how the estimate of the frailty Z might be decomposed into a weighted average: pdf

25.11.2025:

Permitted examination support material: C

• Tabeller og formler i statistikk, Tapir forlag,
• K.Rottman. Matematisk formelsamling,
• One A5 sheet of paper with written (or printed) formulas and notes (on both sides). You are only allowed to bring one such sheet to the exam. Note that we do not use yellow, stamped sheets anymore, so you can use any non-stamped sheet, of any color.
• Approved calculator

18.11.2025: Please find here a new questionnaire about the course Survey. Please help us to improve our teaching by answering this survey as soon as possible, and no later than Friday November 21rd. Of course, you answer anonymously.

14.11.2025: There was an error in lecture 10 when we derived the 95% CI for beta using the information matrix I. I forgot to take the matrix inverse of I first, as is also noted on the lecture slides.

06.11.2025: Project 3 is out .

I received a total of three replies to the first questionnaire that can be summarised as follows:

• All like the organisation of the course, using digitial lectures, a more guided lecture going through larger examples and an interactive exercise session.
• The majority feels that working on project 1 improved the understanding of the theory that was covered.
• People like the interactive exercise sessions and video lectures, but ask for more practice related links. One recommendation was to give the projects out already when the new part of the curriculum starts.
• Some of the Wednesday lectures can be challenging to follow, particularly when extended derivations or calculations make it difficult to grasp the overall objective

07.10.2025: Simen might come some minutes late to the project supervision tomorrow, but please start.

The first questionnaire is now available at https://forms.office.com/e/KRNaFupHkbhttps://forms.office.com/e/KRNaFupHkb. Please help us to improve our teaching by answering this survey as soon as possible, and no later than Friday October 3rd. Of course, you answer anonymously.

01.10.2025: Your solutions to Project 1 is now corrected. Comments on your solution have been sent to you in an email (using the email address you used to submit the project).

11.09.2025: We do not have a reference group is this course. In stead you are asked to give feedback to the lecturer by answering a few questions in a couple of questionnaires. The first questionnaire will be given out soon.

02.09.2025: Unfortunately, I am not available in my office today regarding questions to the last problem given in the exercise hour last week. Please send me an email to andrea.riebler@ntnu.no in the case of questions, so will I answer by email or we arrange a zoom meeting.

28.08.2025: The exercise today will only be from 10:15 to 10:55.

30.06.2025: Welcome to this home page for TMA4275 Lifetime analysis. We will have an information meeting about the course on Tuesday August 19th at 12.15 and the first lecture will be on Wednesday August 20th at 12.15, see Lecture and exercise plan for rooms.

Please note that you are supposed to study the four videos in Introduction to the course before you come to the first lecture on Wednesday. This is as specified in the Lecture and exercise plan.