fix: Fixing errors from the previous commit

In the previous commit "NVSemiParametricGEstimationPostWidder" were mistakenly replaced by "NMVEstimationDensityPW"

Author: Ангелина

src/procedures/__init__.py

@@ -11,7 +11,7 @@
     NVEstimationDensityInvMT,
 )
 from src.procedures.semiparametric.nv_semiparametric.g_estimation_post_widder import (
-    NMVEstimationDensityPW,
+    NVEstimationDensityPW,
 )
 from src.procedures.semiparametric.nvm_semiparametric.g_estimation_given_mu import (
     NMVEstimationDensityInvMTquad,

src/procedures/semiparametric/nv_semiparametric/g_estimation_post_widder.py

@@ -13,7 +13,7 @@
 X_DATA_DEFAULT_VALUE = [1.0]
 
 
-class NMVEstimationDensityPW:
+class NVEstimationDensityPW:
     """Estimation of mixing density function g (xi density function) of NVM mixture represented in classical form Y =
     alpha + sigma*sqrt(xi)*N, where alpha = 0 and mu, sigma are given.