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Variable and Rough

variable

noun

  • Something that is likely to vary; something that is subject to variation.
    • usage: "the weather is one variable to be considered"
  • A quantity that can assume any of a set of values.
  • A star that varies noticeably in brightness.
  • A symbol (like x or y) that is used in mathematical or logical expressions to represent a variable quantity.

adjective

  • Liable to or capable of change.
    • usage: "rainfall in the tropics is notoriously variable"; "variable winds"; "variable expenses"
  • Marked by diversity or difference.
    • usage: "the varying angles of roof slope"; "nature is infinitely variable"
  • Used of a device) designed so that a property (as e. G. Light) can be varied. (
    • usage: "a variable capacitor"; "variable filters in front of the mercury xenon lights"
WordNet 3.0 © 2006 by Princeton University
Webster's Revised Unabridged Dictionary

Variable is an element in a model. For example, in the model RS&Pt+1 = a + b Tbill t + et, where RS&Pt+1 is the return on the S&P in month t+1 and Tbill is the Tbill return at month t, both RS&P and Tbill are "variables" because they change through time; i. E., they are not constant.

rough

noun

  • The part of a golf course bordering the fairway where the grass is not cut short.

verb

adjective

  • Having or caused by an irregular surface.
    • usage: "trees with rough bark"; "rough ground"; "rough skin"; "rough blankets"; "his unsmooth face"
  • Of persons or behavior. ( lacking refinement or finesse)
    • usage: "she was a diamond in the rough"; "rough manners"
  • Not quite exact or correct.
    • usage: "the approximate time was 10 o'clock"; "a rough guess"; "a ballpark estimate"
  • Full of hardship or trials.
    • usage: "the rocky road to success"; "they were having a rough time"
  • Violently agitated and turbulent.
    • usage: "boisterous winds and waves"; "the fierce thunders roar me their music- Ezra Pound; "rough weather"; "rough seas"
  • Unpleasantly harsh or grating in sound.
    • usage: "a gravelly voice"
  • Ready and able to resort to force or violence.
    • usage: "pugnacious spirits... Lamented that there was so little prospect of an exhilarating disturbance- Herman Melville; "they were rough and determined fighting men"
  • Of the margin of a leaf shape; having the edge cut or fringed or scalloped.
  • Causing or characterized by jolts and irregular movements.
    • usage: "a rough ride"
  • Not shaped by cutting or trimming.
    • usage: "an uncut diamond"; "rough gemstones"
  • Not carefully or expertly made.
    • usage: "managed to make a crude splint"; "a crude cabin of logs with bark still on them"; "rough carpentry"
  • Not perfected.
    • usage: "a rough draft"; "a few rough sketches"
  • Unpleasantly stern.
    • usage: "wild and harsh country full of hot sand and cactus"; "the nomad life is rough and hazardous"
  • Unkind or cruel or uncivil.
    • usage: "had harsh words"; "a harsh and unlovable old tyrant"; "a rough answer"

adverb

  • With roughness or violence (`rough' is an informal variant for `roughly'. )
    • usage: "he was pushed roughly aside"; "they treated him rough"
  • With rough motion as over a rough surface.
    • usage: "ride rough"
WordNet 3.0 © 2006 by Princeton University
Webster's Revised Unabridged Dictionary
Variable and Rough in Power Thesaurus