Hi Dr. Dien, I am writing to ask for your assistance as I have encountered some difficulties while attempting to perform a temporal PCA using participants and conditions as observations. My experimental design consists of 3 groups and 4 conditions. Currently, I have NeuroScan .avg files for each individual participant, averaged separately for each of the four conditions (i.e., Total files = Number of Participants × 4). To briefly explain the procedure I followed: Based on the tutorial, I created...