CONTENTS 



THE SAMPLING METHOD 1 



PPSORT— A COMPUTER SUBROUTINE FOR 



SELECTING THE SAMPLE 1 



CALLING PPSORT 2 



CALCULATING ESTIMATES 3 



Population Total 3 



Variance of Population Total 4 



Derivation of Variance Estimate for 



Polynomial Model 5 



EXAMPLES 9 



LITERATURE CITED 12 



APPENDIX I PPSORT Program 13 



APPENDIX II CalUng Program Example 16 



