Arithmetic scale

Arithmetic scale - ARUMUGAM SHANTH I N I GROUP 1 a...

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Figure 2. Incidence rate of gonorrhoea and syphilis in Norway, 1975-1999 0 100 200 300 400 1975 1978 1981 1984 1987 1990 1993 1996 1999 Year Gonorrhoea Syphilis Cases per 100,000 Source: Folkehelsa Figure 3. Incidence rate of gonorrhoea and syphilis in Norway, 1975-1999 0,1 10 1000 1975 1978 1981 1984 1987 1990 1993 1996 1999 Year Gonorrhoea Syphilis Cases per 100,000 ARUMUGAM SHANTHINI GROUP 1 a) Arithmetic scale Advantages : Arithmetic scales are useful when the price range is confined within a relatively tight range. Arithmetic scales are useful for short-term charts and trading. Price movements (particularly for stocks) are shown in absolute dollar terms and reflect movements dollar for dollar. Disadvantages : Arithmetic scale graphs may create a false appearance of acceleration. b) Semi logarithmic Source: Folkehelsa
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ARUMUGAM SHANTHINI GROUP 1 Advantages : Semi-log scales are useful when the price has moved significantly, be it over a short or extended time frame Semi-log scales are useful for long-term charts to gauge the percentage movements over a long period of time. Large movements are put into perspective. Disadvantages : Use only with continuous data c) Histogram Source : http://www.ct4me.net/Ohio_Graduation_Math_Test_Prep_DataStrand.htm Advantages : Visually strong Can compare to normal curve Usually vertical axis is a frequency count of items falling into each category Disadvantages : Cannot read exact values because data is grouped into categories More difficult to compare two data sets Use only with continuous data
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ARUMUGAM SHANTHINI GROUP 1 d) Frequency polygons Source : http://cnx.org/content/m10214/latest/ Advantages : Visually appealing Disadvantages : Anchors at both ends may imply zero as data points Use only with continuous data e) Scatter diagram Source : http://www.thecourse.us/students/ScatterDiagrams.htm
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