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Biostatistics

Question
4 out of 76
 

Mean and SD can be worked out only if the data is on:



A Interval / Ratio scale
B Dichotomous scale

C Nominal scale
D Ordinal scale

Ans. A Interval / Ratio scale Ref: High Yield Biostatistics,

One can CLASSIFY THE DATA into two broad categories:

i. Qualitative data

ii. Quantitative data

A. Qualitative data

Also known as discrete data. It is composed of only certain values and none in between like 3 or 4 but not anything in between. It is classified only by counting the variables (e.g. individuals) having the same characteristics e.g.

Qualitative data are either Nominal or Ordinal

In qualitative data people with same characteristic are counted to form specific groups or classes e.g.

i. Attacked

ii. Died

iii. Cured

iv. Vaccinated

v. Males etc.

vi. Pharmacology: to find the action of a drug

vii. Clinical practice: to test or compare efficacy of a drug/vaccine/treatment

viii. Demography: to find births/deaths/stillbirths etc.

ix. No of patients in the ward

The results obtained from qualitative data are expressed as any of these:

  1. Ratio
  2. Proportion
  3. Percentage
  4. Rate

The statistical methods commonly employed in analysis of qualitative (discrete) data are:

a. Standard error of proportion

b. Chi-square test

B. Quantitative data

It is also known as continuous data. Discrete (qualitative) data can take only certain values, and none in between if the data can take any value; it is called continuous (quantitative) data. Most biomedical variables are continuous e.g.

  1. Weight
  2. Height
  3. Blood pressure
  4. Age

Quantitative data can be either an Interval or Ratio variable and are summarized as Mean, SD or Correlation Coefficient.

The statistical methods commonly employed in analysis of quantitative (continuous) data are:

i. T test

ii. Z test

iii. F test

iv. ANOVA

Qualitative Data

Quantitative Data

Finite, discrete variable

Infinite, continuous variable

No Magnitude

Magnitude – scale

Summarized as Rate, ratio, proportion

Summarized as Mean, SD, correlation coefficient

Bar, pie, pictogram, spot map

Histogram; Frequency polygon; Line diagram, Scatter diagram

Answer to question is in Yes / No

Answer to question is an quantitative value with unit

Biostatistics Flashcard List

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