On the linear term correction for needlets/wavelets non-Gaussianity
  estimators
  We derive the linear correction term for needlet and wavelet estimators of
the bispectrum and the non-linearity parameter fNL on cosmic microwave
background radiation data. We show that on masked WMAP-like data with
anisotropic noise, the error bars improve by 10-20% and almost reach the
optimal error bars obtained with the KSW estimator (Komatsu et al 2005). In the
limit of full-sky and isotropic noise, this term vanishes. We apply needlet and
wavelet estimators to the WMAP 7-year data and obtain our best estimate
fNL=37.5 \pm 21.8.
