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Unformatted text preview: UCF Physics: AST 5765/4762: (Advanced) Astronomical Data Analysis Fall 2008 Lecture Notes: 7. Measurement, Probability, and Statistics 1 Summary Pre-Class: Copy handouts Copy handouts, demos, visuals to canopus 2 Check in: 2:00 — 2:10, 10 min • How was HW3? • Comment on HW4: – A few months in the lab can save hours in the library! – Routines exist to do most of the hard work on HW4. Find them. Use them. – Part of the goal of the assignment is to get you to manipulate larger data entities than just single numbers. Be high-level, let the computer do the work. – The habit of testing your own answers is the highest goal of the class. Problem 2 tests problem 1, and item d of problem 3 is a test of the rest of the problem. Get in the habit. Always do it on your own data processing. – The assumption of others: you are wrong until you prove you are right. 3 Astronomical Data: 2:10 — 2:25, 15 min • What is FITS? • Reading FITS files • Reading header variables • Adding/modifying header variables • Writing FITS files 4 Illegitimate, Systematic, and Random Errors: 2:25 — 2:35, 10 min • A measurement is the best estimate of a quantity in terms of accepted units. 1 • Three types of measurement error: illegitimate, systematic, and random • Illegitimate error: a fundamental problem in the methods or assumptions (think you’re doing one thing, really doing another) • Find and fix! – Check yourselves! Most homework errors are in this category. – We’re particularly picky in this course to prepare you for doing this in real science. – Mars Polar Lander English vs. Metric goof • Systematic error: predictable difference between data and measurement • Quantify and remove....
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This note was uploaded on 11/09/2009 for the course AST 4762 taught by Professor Harrington during the Fall '09 term at University of Central Florida.
- Fall '09