Update MixtureFidner

Author: HuaiyanRen

doc/Complex-Models.md

@@ -158,15 +158,17 @@ Here, we estimate the optimal Q mixture model. To select mixture model and then
 
 	iqtree -s example.phy -m MIX+MFP
 
-Likelihood ratio test (LRT) with p-value = 0.05 is the default method to assess the number of classes in the Q mixture model. To change the p-value:
+BIC is the default criterion to assess the number of classes in the Q mixture model. AIC, AICc or Likelihood ratio test (LRT) are also available to assess the number of classes.
 
-	iqtree -s example.phy -m MIX+MF -lrt 0.01
+To use AIC:
+
+	iqtree -s example.phy -m MIX+MF -merit AIC
 
-Here, we change the LRT p-value to 0.01. To use information criteria instead of LRT to assess the number of classes:
+To useLikelihood ratio test (LRT) with p-value = 0.05 to assess the number of classes:
 
-	iqtree -s example.phy -m MIX+MF -lrt 0 -merit BIC
+	iqtree -s example.phy -m MIX+MF -lrt 0.05 
 
-Here, `-lrt 0` means turning off the LRT, then `-merit BIC` means using BIC to assess the number of classes. (Note that: `-merit` also decides the creterion for selecting subtitution model type in each classes. If using LRT for assessing the number of classes, the default creterion for selecting subtitution model type is BIC.)
+(Note that: `-merit` also decides the creterion for selecting subtitution model type in each classes. If using LRT for assessing the number of classes, the default creterion for selecting subtitution model type is BIC.)
 
 Options for ModelFinder also work for MixtureFinder, e.g.:
 
@@ -178,7 +180,7 @@ Other options for MixtureFinder:
 | Model option   | Description                                                                                                                          |
 | -------------- | ------------------------------------------------------------------------------------------------------------------------------------ |
 | `-qmax`        | Maximum number of Q-mixture classes (default: 10). Specify a number after the option (e.g., `-qmax 5`).                              |
-| `-mrate-twice` | Whether estimate the rate heterogeneity across sites models again after select the best Q-mixture model. 1: yes, 0: no. (default: 1) |
+| `-mrate-twice` | Whether estimate the rate heterogeneity across sites models again after select the best Q-mixture model. 1: yes, 0: no. (default: 0) |
 
 If you use MixtureFinder in a publication please cite: