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Abstract Details

Activity Number: 612
Type: Contributed
Date/Time: Thursday, August 2, 2012 : 8:30 AM to 10:20 AM
Sponsor: Section on Statistical Graphics
Abstract - #305866
Title: Interpreting the Differences Among LsMeans in Generalized Linear Models
Author(s): Robin High*+
Companies: University of Nebraska Medical Center
Address: 2518 S 125th Ave, Omaha, NE, 68144, United States
Keywords: LsMeans ; Graphical Display ; Generalized Linear Models ; Diffogram ; Forest Plot ; Funnel Plot

The effectiveness of visual interpretation of the differences between pairs of LsMeans in a generalized linear model includes the graph's ability to display four inferential and two perceptual tasks. Among the types of graphs which can visualize some or all of these tasks are the lines plot, the forest plot, the funnel plot, and the diffogram. Not only do these visual summaries offer unique visual perspectives of differences among pairs of LsMeans, special features of these graphs expand one's ability to interpret them. For example, the funnel plot helps one to make interpretations with unbalanced data or unequal variances. The diffogram is the only graphical display that allows one to quickly make interpretations of all four inferential and two perceptual tasks. In the presence of significant interactions differences among LsMeans can be easily viewed for one of the factors by slicing the other variable(s) in the interaction. The SAS graphical procedures SGPLOT and SGPANEL efficiently produce the forest and funnel plots for differences among LsMeans for single factors and interactions. PROC GPLOT with the capabilities of annotation produces the enhanced diffogram.

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