PSPP-BUG: [bug #26025] Advanced sampling

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?26025>

                 Summary: Advanced sampling
                 Project: PSPP
            Submitted by: None
            Submitted on: Fri 27 Mar 2009 08:42:04 UTC
                Category: Graphical User Interface
                Severity: 5 - Average
                  Status: None
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                 Release: None
                  Effort: 0.00

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Details:

Unfortunately SPSS has some stupid solutions for sampling and there is no
need for PSPP to follow them. It could be better. :-)

In menu Data - Select cases, someone can select Random sample of cases. One
option is to set approximate percent of cases to be sampled, other is to set
exactly how many cases should be selected from the first n cases.

Let's say you want to select a fixed number of cases, but from all cases (in
fact this scenario is very likely). You must first check how many cases is
there in dataset and then enter this number manually.

So it would be just great to have an option to select a fixed number of cases
from ALL cases.

Another good thing would also be to have different methods of sampling, for
instance "pure" random sampling, PPT (probalility proportional to size), two-
or more stages sampling or subsamples (first sample n units, then randomly
divide that sample into several subsamples of different sizes), etc.




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