Computes pdf of the skewed symmetric model.

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`x` |
scalar or vector of values to compute the pdf. |

`spec1` |
a character string specifying the parent distribution |

`arg1` |
list of arguments/parameters of the parent distribution |

`spec2` |
a character string specifying the parent distribution |

`arg2` |
list of arguments/parameters of the parent distribution |

`log` |
logical; if |

The pdf of skewed symmetric model has a general form of:

*
f(x) = 2h(x)G(x), \quad -∞ < x < ∞
*

where *h(x)* and *G(x)* are the pdf and cdf of parent distributions, respectively.

An object of the same length as `x`

, giving the pdf values computed at `x`

.

Shaiful Anuar Abu Bakar

S.A. Abu Bakar, S. Nadarajah, Z.A. ABSL Kamarul Adzhar, I. Mohamed. gendist: An R package for generated probability distribution models, submitted.

Azzalini, A. (1985). A class of distributions which includes the normal ones. Scandinavian journal of statistics, 171-178.

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