# E Corrections & Remarks

Errata and remarks concerning the first edition print version of the book are displayed here.

Last updated: 08 April, 2022.

## Chapter 3.3.3

In the imaginary experiment in Figure 3.4, four participants experience the event during the 10-year observation period. In the calculation example, however, we use $$E=3$$ to calculate the incidence rate. In the online version, we have now corrected this so that $$E=4$$, like in the experiment.

## Chapter 4.2

A new version of {meta} (version 5.0-0) has recently been released. We adapted the code in this chapter accordingly to avoid deprecation messages:

• The comb.fixed and comb.random arguments are now called fixed and random, respectively.

• To print all studies, one now has to use summary method for {meta} meta-analysis objects.

## Chapter 7.3

A new version of {meta} (version 5.0-0) has recently been released. We adapted the code in this chapter accordingly to avoid deprecation messages:

• The byvar argument is now called subgroup.

• To print all studies, one now has to use summary method for {meta} meta-analysis objects.

## Chapter 12.2.1

The print version contains a factual error concerning the definition of full rank in non-square (rectangular) matrices. It is stated that a “matrix is not of full rank when its rows are not all independent.” This, however, only applies to square matrices and non-square matrices with less rows than columns ($$m < n$$). In our example, there are more rows than columns; this means that $$\boldsymbol{X}$$ is not full rank because its columns are not all independent (in $$m > n$$ matrices, rows are always linearly dependent). This erratum has been corrected in the online version.

## Chapter 12.2.2

A new version of {netmeta} (version 2.0-0) has recently been released. We adapted the code in this chapter accordingly to avoid error messages:

• The latest version of {netmeta} resulted in non-convergence of the Fisher scoring algorithm implemented in rma.mv. This problem pertains to all versions of {dmetar} installed before 24-Oct-2021. To avoid the issue, simply reinstall the lastest version of {dmetar}.