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What are the properties of normal distribution in SPSS research?

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What are the properties of normal distribution using SPSS research?

1 comment to What are the properties of normal distribution in SPSS research?

  • Francis

    Properties of Normal Distribution
    • Symmetric bell-shaped curve
    • Range between -3 and 3 of the standardized variable.

    FREQUENCIES.

    Procedure from SPSS Analyze menu
    Frequencies
    A dialogue box appears, double click the variable(s) of interest so that they appear on the box labeled variable(s), click on the chart button. The dialogue box that appears, click on Histograms and also check the sub option WITH NORMAL CURVE.
    This will allow you to assess whether you data is normally distributed.

    Note normal curve is symmetrical bottom shaped bell.

    HISTOGRAM

    Procedure from SPSS
    Graphs menu
    Histogram

    Double click on the variable under consideration, click on DISPLAY NORMAL CURVE sub option then click ok this gives a solution jut like the one above.

    Z-SCORE
    When a data is assumed to be normally distributed or the statistics assume normal distribution ten it’s advisable to standardize those variables to reduce bias.

    Procedure from SPSS Analyze menu

    Descriptive statistics

    Select the variable(s) under consideration check the box SAVE STANDARDIZED VALUES AS VARIABLES and click ok.

    Now the standardized values are displayed on the data editor view. From there you can SELECT CASES that satisfy normal distribution (those that lie between -3 and 3 of the standardized value)

    SELECT CASES
    Procedure from SPSS Data menu
    Select cases

    The dialogue that appears, click on IF CONDITION IS SATISFIED then the IF button, another dialogue appear where you type you condition. After all that, the rows that satisfy the condition are selected and indicated by a diagonal line in the numbering column on the data view window. The cases that are indicated by a diagonal line are the ones used in the analysis.

    Check on PP-Plots that test on various distributions.
    Procedure from SPSS
    Graphs menu
    P-P
    Select one or more numeric variables and move them onto the Variables list.
    Select a test distribution

    The values of Kurtosis and Skewness is zero when the data is normally distributed

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