Poll takers usually acknowledge that these problems exist but maintain that they can be overcome by careful survey procedures and by proper interpretation of results.
All analyses were performed with SAS v9.3 using SURVEY procedures to account for the study design (SAS v9.3, SAS Institute Inc., Cary, NC, USA).
A field survey usually involves three aspects: survey items, survey procedures and survey methods.
Figure 2 Survey procedures autonomously carried out by the AUV Tuna-Sand.
Survey procedures generally involve plot location and establishment, survey of tree attibutes and plot attributes.
An overview of the survey procedures, sample selection and administration is given here.
This article details the methodology and sampling frame for the NCJTP survey, response rates, and survey procedures.
Results of the different survey procedures are demonstrated using data collected on the lower Roanoke River, USA.
Therefore, all analyses, including standard errors, were adjusted for the design using STATA 14 STATA Corp LPP, College Station, Tex) and its survey procedures (Heeringa and West 2010).
We used the Stata survey procedures to account for the sampling design and sampling weights to account for differential probability of selection between strata.
All statistical testing and variance estimation accounted for the complex sampling frame of the NEISS using SURVEY procedures in SAS version 9.3 (SAS Institute , Inc Cary, NC).
