Trying to remember a statistical phrase

What is it called when you have too many independent variables or subgroups (in backtesting) for the available number of data points thereby rendering it impossible to have a sufficient sample size in each basket. Any ideas?

Mark

Trying to remember a statistical phrase

Ill-posedness?
Ill-posed problem?
Overfitting?

Is that what you are looking for?

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"Curse of dimensionality" is what I was thinking of.

Thanks for trying, fxshrat!