Researchers chose to use pua songnai distribution information education 2 format is information that has not been cut and the cutting data and statistical tests in the test compared two Chrysler shadings at the 0.05 significance level.
Researchers use Poisson distributions in Sohn's study two versions, without truncation. And data truncation. And the statistical test Chi Square test compared harmony. The significance level of 0.05
The choice of frequency of longitudinal data model in 2 is data without cutting tip and information with the cutting tip. Statistical test and chi-square goodness-of-fit test, significant level 0.05.