Diagnosing a Missing Group Column in Factor Analysis

Summary

This support post reports a KeyError during a Chinese equities factor analysis. The example defines an operating cash flow growth factor, selects the CSI 300 universe and benchmark, and requests ten portfolio groups. The failure occurs when the analysis routine tries to select a column named group from its group-level data while calculating grouped daily returns. The traceback indicates that the expected column is absent at that point in the workflow.

The post supplies the factor query configuration and stack trace, which help locate the failing stage in a factor evaluation pipeline: group return aggregation, after individual stock returns have been computed. It does not include a reply, diagnosis of why the grouping column was missing, or a fix. Consequently, it is useful as an example of a pipeline schema error, but it does not establish whether the cause lies in factor preprocessing, data availability, or the analysis implementation. No performance results are reported.

Key ideas

• The reported failure occurs while aggregating daily returns by factor group.
• The analysis expects a group column that is missing from the intermediate data frame.
• The example evaluates an operating cash flow growth factor over a specified Chinese stock universe.
• The post includes no confirmed cause or repair for the error.

Tags

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.