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1 At present, the methods of random sampling, systematic sampling and stratified sampling are widely used in remote sensing sampling.

2 Methods Systematic sampling method was used in field Oncomelania investigation, and laboratory and field simulating drowning methods were also performed to observe survival of Oncomelania.

3 Through systematic sampling and geochemical analysis the geochemical characteristics of source rock and oil are clearly and the spatial relationship between them has been established.

4 Line transects of systematic sampling were used to survey the fundamental characteristics of the environmental variables in the study area.

5 The method of systematic sampling is applied to select respondents for face-to-face interviews. The total amount of the exact questionnaire is 405 respondents, while the sampling error is about 4.87%.

6 METHODS The systematic sampling methods were used. 4 107 residents were investigated by questionnaires and some blood indexes were examined.

7 This paper carried out a systematic sampling and analysis on water quality of Jinan spring system.

8 Systematic sampling, properly conducted, applies audit models to actual data and should expose illegal and unethical behavior when the actual data diverges improperly from the applicable models.

9 Based on the zonal model of compression faults, systematic sampling has been carried out in nine examples including analysis of 36 samples.

10 A method of systematic sampling has been adopted for Giant panda ( Ailuropoda melanoleuca) in Foping Nature Reserve.

11 Then 5% of the data was selected with systematic sampling method by National Health Research Institute (NHRI) and was categorized according to age, gender, disease pattern and specialty.

12 During the course of cluster sample verification, systematic sampling and stratified sampling"s accuracy are prior to simple random sampling"s.

13 The Public Records Office currently retains some supplementary benefit records but there is no systematic sampling system.

14 The current nutrient status of crops can now be determined through the systematic sampling of plants as appropriate times.

15 Method 15 hospitals and 2 937 residents were selected and studied through random and systematic sampling methods in Hainan Province.

16 The efficiency of regression estimate was usually higher than systematic sampling.

17 Methods 962 households in three regions of Baoding city were selected for the household survey through two stage sampling method - random cluster sampling and systematic sampling.

18 Visitor interviews were conducted from July 1997 to July 1998. Totally,[www.Sentencedict.com] 699 effective questionnaires were obtained by systematic sampling.

19 This paper deals with the estimation of population mean in systematic sampling by use of auxiliary information in order to improve the accuracy of the estimate.

20 The outpatients expenses in a teaching hospital in Shiyan were investigated by means of systematic sampling.