I welcome questions or comments about the content of my books.

I might be able to answer questions about the analysis of your data provided the question is short and well-phrased. However, a reliable answer often requires a full understanding of the problem. This requires a substantial amount of my professional time.

If you need serious help in analysing your data, I strongly recommend that you seek the help of a local statistician. Face to face interaction is far more effective and less prone to misunderstanding than email exchanges.