class_docstr: Results from a t contrast of coefficients in a parametric model.
  
  The class does nothing, it is a container for the results from T contrasts,
  and returns the T-statistics when np.asarray is called.
class_docstr_tok: ["Results","from","a","t","contrast","of","coefficients","in","a","parametric","model",".","The","class","does","nothing",",","it","is","a","container","for","the","results","from","T","contrasts",",","and","returns","the","T-statistics","when","np.asarray","is","called","."]
code: def __str__(self):
      return "<T contrast: effect=%s, sd=%s, t=%s, df_den=%d>" % (
          self.effect,
          self.sd,
          self.t,
          self.df_den,
      )
  
imports: import numpy
  from nibabel.onetime import auto_attr
  from numpy.linalg import inv
  from scipy.stats import t
  from ...utils.matrices import pos_recipr
label_desc: Use image node_id 3 for calling the TContrastResults obj's underlying member method code with example usage: obj.__str__() and returns: unknown