### Confidence Regions for Regression Coefficients

Let’s consider the usual linear regression model, with the full set of assumptions: y = Xβ + ε ; ε ~ N[0 , σ2In] , (1)where X is a non-random (n × k) mat...

[Read more...] Let’s consider the usual linear regression model, with the full set of assumptions: y = Xβ + ε ; ε ~ N[0 , σ2In] , (1)where X is a non-random (n × k) mat...

[Read more...] I am comparing estimates from subject-specific GLMMs and population-average GEE models as part of a publication I am working on. As part of this, I want to visualize predictions of each type of model including 95% confidence bands. First I had to ma...

[Read more...] Recently a student asked about the difference between confint() and confint.default() functions, both available in the MASS library to calculate confidence intervals from logistic regression models. The following example demonstrates that they yield d...

[Read more...] This is my first blog since joiningR-bloggers. I’m quite excited to be part of this group and apologize if I boreany experienced R users with my basic blogs for learning R or offendprogrammers with my inefficient, sloppy coding. Hopefully writing for...

[Read more...] ..an illustrative example for testing proportions and presenting the results.the data: number of indigenous and alien plant species with and without vegetative reproduction. Hypothesis: The proportion of species with vegetative reproduction is differen...

[Read more...]No “That” Left Behind? I came across a post on Language Log last week giving some evidence that Obama tends to add that to the prepared version of his speeches. For example, in a recent speech at George Washington University, … Continue reading → [Read more...]

Sigmoid curve fitting for transpiration measurements from porometer at different water potentials (pressure):Read more »

[Read more...] In a recent post, I discussed some statistical consultancy I was involved with. I was quite proud of the nice ggplot2 graphics I had created. The graphs nicely summarised the main points of the paper: I’ve just had the proofs from the journal, and next to the graphs there ...

[Read more...]How many observations should you have before constructing a confidence interval? [Read more...]

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