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normality of variable

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Discussion thread: General
kursten
26 November 2019
normality of variable

How I can check the normality of each variable?

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Jason Jiang
20 February 2020

There are two main methods of assessing normality: graphically and numerically.

Graphical interpretation has the advantage of allowing good judgement to assess normality in situations when numerical tests might be over or under sensitive, but graphical methods do lack objectivity. If you do not have a great deal of experience interpreting normality graphically, it is probably best to rely on the numerical methods. SPSS Statistics allows you to test all of these procedures within Explore... command.

Reference: https://statistics.laerd.com/spss-tutorials/testing-for-normality-using-spss-statistics.php

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Hobbs
10 February 2020

Then what to do if the scores is not normally distributed nor a straight line?

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imir88
26 November 2019

It can be checked by using a scatterplot. When you look at a scatterplot of scores, a straight line should be shown (roughly), rather than a curve.

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kursten
26 November 2019

Thanks imir. How about linearity?

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imir88
26 November 2019

It can be checked by inspecting the histograms of scores on each variable. If the scores are normally distributed, you could see a bell-shaped curve.

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