To meet the needs of s ci entific strength evaluation and technological developmental strategy to varying data requirement, this paper puts forward the essential principles of the data g athering, the classified guidance and the approach to the investigation gatherin g to prospect directing the investigation gathering interrelating to data more s cientific, accurately and effectively.

After transforming quarterly qualitative survey data publicized from the Consumers’Saving Survey System conducted by the People’s Bank of China into quantitative expected inflation data, and get quarterly inflation rate out of monthly CPI, this thesis studies the methods of how to use inflation expectation to forecast real inflation rate.

The state of undergraduate students employment has attached more importance to employ in recent years,according to a number of investigation table data,to analyze the association of attributes between those data.

Sampling methods of resident trip investigation;

To solve problems in the sampling process of resident trip investigation,this paper applied mathe- matical statistics to studying the characteristics of stratified sampling method.