About Error and Effective Number的用法和样例：
- Why does Microsoft collect information about errors and problems?
- The average heterozygosity and effective number of alleles among 15 populations were 0.2746 and 1.559 respectively.
- The typist made a clerical error and gave the date as the31st June.
- The characteristics of gross errors and cycle slips are analyzed with emulating LEO-based GPS phase observations,the steps and effect of detection and repair are explained.