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Introduction

Important Points
Different types of data are collected in medical research. The scale on which a characteristic is measured has implications for the way the information is displayed and summarized. A
variable is a characteristic of interest, which can vary, i.e. take on different values, eg – height, sex, carcinoma staging etc.


To measure variables we use a scale of measurementthe degree of precision with which a characteristic is measured, it also determines which statistical methods may be used to analyze the data.





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