title: Is it possible that the number of basic functions is more than the number of observations in spline regression?
body: <p>I want to run regression spline with B-spline basis function. The data is structured in such a way that the number of observations is less than the number of basis functions and I get a good result.
  But I`m not sure if this is the correct case.<br />
  Do I have to have more rows than columns like linear regression?<br />
  Thank you.</p>