DataFusion recently got support for linear regression aggregate functions (https://github.com/apache/arrow-datafusion/pull/7211). Postgres and DuckDB also support these functions (I haven't looked into other dialects).
We can use these to implement the vega regression transform for type == "linear".
With a bit of manipulation, we should also be able to implement log(x) regression. I don't think the other regression types are expressible in terms of linear regression though.
DataFusion recently got support for linear regression aggregate functions (https://github.com/apache/arrow-datafusion/pull/7211). Postgres and DuckDB also support these functions (I haven't looked into other dialects).
We can use these to implement the vega
regressiontransform fortype == "linear".With a bit of manipulation, we should also be able to implement log(x) regression. I don't think the other regression types are expressible in terms of linear regression though.