A friend recently asked whether I trusted the inferences from heteroskedastic probit models. I said no, because the heteroskedastic probit does not allow a researcher to distinguish between non-constant variance and a mis-specified mean function. In particular, my friend had a hypothesis that the variance of the latent outcome (commonly ...

Especially when analyzing time series, we often need plots with two vertical axes. Researchers often expect the two series to \"move together,\" but with different locations and scales. To show that the series move together, you should give each series its own scale. One vertical scale should appear on the ...

I show how to position the vertical axis label of an R plot above the axis and orient it horizontally as suggested by Stephen Few. I encourage you to share this with others and contribute to the conversation at Labeling the Vertical Axis in R Plots, which first appeared at ...

In this post, I describe how to gain control over the axes in your R plots.