*ScienceSuit* has a number of built-in
functions for both discrete and continuous probability distributions and for each
of these distributions, similar to R, *ScienceSuit* has four primary
functions. Each function has a one letter prefix (d, p, q, r) followed by the
root name of the distribution. For example, *dnorm* is the height of the *
density* of a *normal* distribution whereas *dbinom* returns the *
probability* of an outcome of a *binomial* distribution.

The following tables can prove to be handy to understand the meaning of the prefixes and also relating distributions to the function names. (From statistics notes of Bret Larget, 2003):

Prefix |
Continuous |
Discrete |

d |
density | probability (probability mass function) |

p |
probability | probability (cumulative distribution function) |

q |
quantile | quantile |

r |
random | random |

Distribution | Root |

Uniform | unif |

Binomial | binom |

Poisson | pois |

Normal | norm |

t | t |

F | f |

Chi-square | chisq |

Wilcoxon Sign Rank | signrank |