General Survey Analysis

This menu can be used to calculate estimates from surveys, together with the asymptotic standard errors, allowing for the design of the survey.

Information about the numbers of sampling units in the survey population is required and can be supplied in one of three ways.

The weights can be supplied in a variate. This will generally be the inverse of the probability of selection (pi expansion weights), however, cannot convey the full design information for multi-stage surveys.
The population sizes can be specified by supplying the number of primary sampling units per stratum and for a two-stage design, the number of secondary units in each primary sampling unit. These options can be set by selecting the Population Sizes and and Specify Population Sizes options, and then clicking on the Specify button.
Using the full survey population with unsampled (or non-responding) units indicated by missing values for the response variables. To use this method select the Population Sizes and and Use full survey population options.

Design

Specifies the type of survey to tabulate. You can choose from a simple random survey, a stratified random survey, one stage cluster survey or two-way survey.

Data

This is the variate containing the survey data to be analysed. It should contain a value for each unit in the population, with unsampled or non-responding units being indicated by missing values.

Estimate Ratio

When selected, you can calculate estimates of the ratio Y/X by supplying a variate containing data for the denominator (X).

Stratification factor

For a stratified survey, this is the factor indicating the stratum to which each unit belongs.

Sampling Units

A factor indicating the primary sampling units for a two stage survey or one stage cluster survey.

Classification factor(s)

One or more factors separated by commas to define subsets of the data for which estimates are required. By default, estimates of totals, means or ratios are calculated for the whole population.

Labels

This is an optional variate, factor or text which is used to label influential points. If it is left blank points are labelled by the numbers 1...n.

Weights

An optional variate containing survey weights.

Population sizes

When selected, information can be supplied about the numbers of sampling units. Select the Specify Population Sizes setting and click on the Specify button to supply the number of primary sampling units per stratum, or, the number of secondary units per primary sampling unit (for a two-stage design). Alternatively, select the Use full survey population setting to use the full survey population where unsampled (or non-responding) units are indicated by missing values.

Available Data

This lists data structures appropriate to the current input field. The contents will change as you move from one field to the next. Double-click on a name to copy it to the current input field; alternatively, you can type the name directly into the input field.