SDA 3.5 Documentation for UPDATES

NAME

DESCRIPTION

CHANGES TO ANALYSIS PROGRAMS

• Precision-based Suppression of Statistics
  The TABLES and MEANS programs can now suppress the output of a particular percentage or mean, if it does not meet certain criteria for precision. The criteria for the desired minimum levels of precision are specified by adding them to the disclosure file.

• REGRESS and LOGIT

  • The regression programs now compute standard errors for complex samples. The method used is jackknife repeated replication. In order to enable this option, the stratum and/or cluster variables must be specified in the HARC file for a dataset. For details see the SDA document on Methods Used by SDA 3.5 for Computing Standard Errors for Complex Samples.
  • Multiple dummy variables for each value of a numeric variable can now be created with a single command. For details see the online help file for analysis programs.
  • Confidence intervals can be requested (90%, 95%, or 99%).
  • The variance/covariance matrix of the regression coefficients can be requested.
  • The list of independent variables can be suppressed. If many consecutive analyses are run with the same independent variables, the repition of that list of variables may seem redundant. That list can now be suppressed by the user.

• QUICK TABLES

  New options have been added for displaying the crosstab output:

  • The number of decimals shown in the percentages can now be specified -- from 0 to 6 decimal places.
  • The unweighted N’s for the percentages can be suppressed.
  • The weighted N’s (if a weight is used) for the percentages can be suppressed.
  • The headings for the row and/or column totals can be modified.

  For more information on these new options, see the document with the Quick Tables Installation Information.

  Note that ’Quick Tables’ was developed for ICPSR a few years ago and was not distributed routinely. However, Quick Tables is now included in the standard SDA distribution package.

BROWSER-SPECIFIC FIXES

There was a problem with the Chrome and the Safari browsers, due to a bug in the WebKit library used by both of those browsers. They would not re-submit a form for execution unless a key was pressed on the form. (A mouse click to change a radio button or check box was not sufficient.) In SDA 3.5 we’ve developed a work-around for the bug in those browsers, so that Chrome and Safari users will not encounter problems.