The objective of this study was to investigate the circumstances under which dissemination of prostate-specific antigen (PSA) testing, beginning in 1988, c... E Ruth,JM Legler,EJ Feuer,... - 《J Natl Cancer Inst》 被引量: 1591发表: 1999年 Cancer surveillance series: interpreting trends in...
import excel apsa, firstrow . tabulate d1 d1 0 1 2 3 4 Total Freq. 2,000 2,000 2,044 2,037 1,919 10,000 Percent 20.00 20.00 20.44 20.37 19.19 100.00 . summarize 1.d1 Variable Obs 1.d1 10,000 Mean .2 . summarize i.d1 Variable Obs d1 1 10,000 2 10,000 3 10,000 ...
Similar results may be shown for the use of the reciprocal transformation (1/"Number") which applies only to positive values. While there are many data transformations in use, this paper focuses on the natural logarithm transformation and the reciprocal transformation, which are transformations ...