Posts Tagged ‘ overlay option ’

Example 9.22: shading plots and inequalities

March 1, 2012
By
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...

Read more »

Example 8.30: Compare Poisson and negative binomial count models

March 15, 2011
By
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...

Read more »