Posts Tagged ‘ lines() ’

Example 9.23: Demonstrating proportional hazards

March 13, 2012
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Example 9.23: Demonstrating proportional hazards

A colleague recently asked after a slide suitable for explaining proportional hazards. In particular, she was concerned that her audience not focus on the time to event or probability of the event. An initial thought was to display the cumulative haz...

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Example 9.22: shading plots and inequalities

March 1, 2012
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Example 9.22: shading plots and inequalities

A colleague teaching college algebra wrote in the R-sig-teaching list asking for assistance in plotting the solutions to the inequality x^2 - 3 > 0. This type of display is handy in providing a graphical solution to accompany an analytic one. RThe plot...

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Example 8.30: Compare Poisson and negative binomial count models

March 15, 2011
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Example 8.30:  Compare Poisson and negative binomial count models

How similar can a negative binomial distribution get to a Poisson distribution?When confronted with modeling count data, our first instinct is to use Poisson regression. But in practice, count data is often overdispersed. We can fit the overdispersio...

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Example 8.12: Bike ride plot, part 1

November 1, 2010
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Example 8.12: Bike ride plot, part 1

The iPhone app Cyclemeter uses the phone's GPS capability to record location and other data, and infer speed, while you ride. I took a ride near my house recently, and downloaded the data. I'd like to examine my route and my speed. A simple plot of ...

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