I am getting negative values for the R2 Squared after doing the linear regression on my data. What does it Suggest? Does it suggest the output is useless?
There's a pretty good treatment of this already existing on the stats stackexchange, which I posted as reference since most of this answer will be similar, but possibly less extensive.
The short is that your
R^2 value is comparing your regression to a horizontal line. If your
R^2 value is less performant than a horizontal line you'll see a negative value.
Image posted below for reference: