This menu is used to do a design based or ratio analysis for a simple or stratified random survey.
Design
Used to switch to either a simple random survey or a stratified random 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.
Method
Specifies whether to analyse using expansion raising or ratio estimation. Select
Design based analysis if you want tio use expansion raising (i.e. the usual stratified
random sampling analysis) but within a stratum units must either all have base data or
all lack it. Alternatively, select Ratio analysis to supply base data for ratio estimation.
Base (X) data
For a ratio analysis this specifies a variate containing the auxiliary data to form the denominator of the ratio. This must be present for each unit within a
stratum, although if base data is not available for a stratum all units in that stratum may be set to missing value. If a stratum
contains a mixture of base data and missing values a fault will result.
Stratification factor
For a stratified random survey, this is the factor indicating the stratum to which each unit belongs.
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.
Data format
The variate specified in the Data box may either contain all the units in the population, with
unsampled or non-responding units indicated by missing values, or it may just contain the responses. If this option is set
to Response data only, the population sizes box must be set.
Population sizes
Where the data contains only the response data, this box is used to indicate the total number of units in the population for
each stratum. These are supplied in a variate or table with one value for each stratum or, in the case of a simple random design,
a single number.
Base data totals
For ratio estimation this should contain the population totals of the base data in each stratum.
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.