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1.
PRF is based on population data as a whole,
SRF is based on Sample data
2.
We can draw only one PRF line from a given population.
But we can Draw one SRF for one sample from that population.
3. PRF may exist only in our conception and imagination.
4.
PRF curve or line is the locus of the conditional mean/ expectation of the independent variable Y for the fixed variable X in a sample data.
SRF shows the estimated relation between dependent variable Y and explanatory variable X in a sample.
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