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Biostatistics

Question
6 out of 76
 

The response which is graded by an observer on an agree or disagree continuum is based on:



A Visual analog scale
B Guttman scale

C Likert scale
D Adjectival scale

Ans. C Likert scale

Ref: A Dictionary of Public Health by J Kishore; Pg: 475 – 476

Textbook of Community Medicine Sunder Lal, Pg. -47

Just remember that ordinal variables follow Likert scale. Various types of scales used in biomedical practice and their interpretation are as follows:

a. Likert scale

i. Is a type of ordinal scale

ii. Also known as Summative scale

iii. Generally used to quantify attitudes & behavior

iv. Usually a bipolar scale

v. Responses are graded on an agree disagree continuum like – Strongly agree – Agree – Neutral – Disagree – Strongly Disagree

b. Guttman scale

i. Also known as Cumulative scale

ii. Usually an unipolar scale ranked in order of difficulty from least extreme to most extreme position

iii. Contains a series of statements that expresses increasing intensity of a characteristic and the respondent is asked to agree or disagree to with each statement.

c. Visual analog scale

i. Used to measure characteristics that range across a continuum of values and cannot be easily measured directly like Pain

ii. Operationally VAS is usually a horizontal line 10 cms in length, anchored by word descriptors at both ends; patient marks on the line the point that they feel represents the perception of their current status.

iii. Used in Anaesthesia

d. Adjectival scale

Is a linguistic scale which uses a set of words of same grammatical category that can be ordered by their semantic strength eg: hot, warm, lukewarm belong to same adjectival scale reflecting different intensity of temperature

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