physiotherapy lecture for students

1. Sampling Design
A. Thangamani ramalingam
PT, MSc(psy),PGDRM, ACspss MIAP

2.  Probability sampling
 Non probability sampling
Different types of sample design

3. Statistics is the science
of dealing with numbers

6. Multistage Sampling

7. Criteria for selecting sampling
procedure
 Inappropriate sampling
frame
 Defective measuring
device
 Non-respondents
 Indeterminancy principle
 Natural bias in the
reporting of data
 while selecting a sampling
procedure, researcher
must ensure that the
procedure causes a
relatively small sampling
error and helps to control
the systematic bias in a
better way.

8. Implications for sample design
 Sample size
 Selection of sample
 Less error
 Save time and money

9. steps in sampling design
 Type of universe
 Sampling unit
 sampling frame(source
list)
 Sample size
 Parameters of interest
 Financial constraints
 Procedure of sampling

10. characteristics of good sample
design
 A truly representative
sample
 Small sampling error
 No systematic bias
 Less fund used
 Generalizability of results