*Article* **Normal-***G* **Class of Probability Distributions: Properties and Applications**

### **Fábio V. J. Silveira 1, Frank Gomes-Silva 1,\*, Cícero C. R. Brito 2, Moacyr Cunha-Filho 1, Felipe R. S. Gusmão 1 and Sílvio F. A. Xavier-Júnior 3**


Received: 28 September 2019; Accepted: 12 November 2019; Published: 15 November 2019

**Abstract:** In this paper, we propose a novel class of probability distributions called Normal-*G*. It has the advantage of demanding no additional parameters besides those of the parent distribution, thereby providing parsimonious models. Furthermore, the class enjoys the property of identifiability whenever the baseline is identifiable. We present special Normal-*G* sub-models, which can fit asymmetrical data with either positive or negative skew. Other important mathematical properties are described, such as the series expansion of the probability density function (pdf), which is used to derive expressions for the moments and the moment generating function (mgf). We bring Monte Carlo simulation studies to investigate the behavior of the maximum likelihood estimates (MLEs) of two distributions generated by the class and we also present applications to real datasets to illustrate its usefulness.

**Keywords:** probabilistic distribution class; normal distribution; identifiability; maximum likelihood; moments
