While the available R packages for EEG do not seem to support the EGI eeg data format (see Robin Kramer's comment), you might want to try MNE-Python As a free and open alternative to any toolbox implemented in Matlab.

MNE-Python does support the EGI eeg data format among many others. Furthermore, there are several comprehensive examples to get you started.

While the available R packages for EEG do not seem to support the EGI eeg data format (see Robin Kramer's comment), you might want to try MNE-Python as a free and open alternative to any EEG toolbox implemented in Matlab.

MNE-Python does support the EGI eeg data format among many others. Furthermore, there are several comprehensive examples to get you started.