Logistic regression 08

Logistic regression 08 - Logistic regression ESM 206C May 6...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Logistic regression ESM 206C May 6 2008
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Categorical dependent variables Firm joins Energy Star or not Parcel of land developed as urban, agriculture, or open space Species goes extinct or not Opinion is Strongly Opposed, Opposed, Neutral, Favorable, or Strongly Favorable Residuals will clearly not be normal! Relevant probability distributions are binomial and multinomial Instead of thinking about means, we think about probabilities of a given result Can still do hypothesis testing and fit linear models
Background image of page 2
3 Tumors and ETU Treated foods contain ETU (ethylenethiourea) – may be harmful to health. Big question: How does exposure affect chance of contracting disease? Some rats exposed to ETU contracted tumors. 6 dose groups (0,5,25,125,250,500) ~70 rats per group. Dose # rats # w/ tumors 0 72 2 5 75 2 25 73 1 125 73 2 250 69 16 500 70 62
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
A not very interesting question If I pick a rat at random from the dose=250 group, what is the probability that it has a tumor? 4
Background image of page 4
If I get a new rat and give it a dose of 250, what is the probability that it will get a tumor? 5
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 24

Logistic regression 08 - Logistic regression ESM 206C May 6...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online