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DIAGRAMME SEMI-LOGARITHMIQUE [1 record]

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Record 1 2015-04-13

English

Subject field(s)
  • Statistical Graphs and Diagrams
CONT

Ratio charts are also called semilogarithmic or semilog charts. This particular chart is designed with an arithmetic scale (equal-unit scale) along the X axis, and one or more logarithmic cycles along the Y axis. ... The general principles and mechanical details of drawing the data points and the data path are identical to the procedures for any line chart.

CONT

The interpretation of information mapped onto a semilog (ratio) chart is, therefore, somewhat different from the ordinary arithmetic line graph. The important difference is this: the slope of the data path on a ratio chart reveals the rate (percentage change) at which the Y variable is changing per unit of X. ... the ratio chart (semilogarithmic variety) is measuring percentage change in the Y variable only. Since the X scale is arithmetic, changes in the X portion of the data path are arithmetic, not ratio (or percentage) changes. Semilog (ratio) charts are usually employed to graph data ... when a Y variable changes by a large amount in a relatively short range of the X variable.

French

Domaine(s)
  • Diagrammes et graphiques (Statistique)
CONT

Les axes des abscisses et des ordonnées peuvent tous deux recevoir le caractère logarithmique, mais l'axe des ordonnées peut s'en trouver seul affecté [...] Les graphiques à coordonnées [...] dans lesquels seul l'axe des ordonnées présente cette particularité sont dits semi-logarithmiques [...]; ces derniers possèdent donc un axe des abscisses divisé en parties égales et un axe des ordonnées portant, comme l'échelle de la règle à calcul, des divisions de plus en plus petites correspondant à des grandeurs croissant arithmétiquement. Il s'agit là de graphiques directement dérivés de ceux qu'on appelle à coordonnées cartésiennes et qui se tracent comme ceux-ci, en reliant les points d'intersection des coordonnées.

CONT

[...] Ce type de graphique est à recommander chaque fois qu'on voudra faire apparaître des rapports et qu'on étudiera des taux de variation (valeur relative des variations et non plus valeur absolue).

Spanish

Campo(s) temático(s)
  • Diagramas y gráficos estadísticos
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