Hello,   I have symptom data on 90 participants, which was captured weekly via survey for a total of 4 weeks. Each week  the study participants rated their symptom severity as: none, mild moderate, severe or very severe.     We are interested in assessing how consistent a participants' symptom rating is across the 4 weeks. This will give us insight into weather we can conduct patient symptom assessments in a trial or in real world clinical practice setting less often than weekly (i.e. monthly).   What would be the best way to evaluate and measure intra-rater reliability and repeatably? Is there an analog to the intraclass correlation coefficient that can be used with ordinal categorical variables?   Thank you! ... View more