Table 13-14 Excel bias plot

From the Output Tables menu, select Table 13-14 to output Table 13. Excel plots can also be produced.

Table 13 Excel plots correspond to Table 13.

Table 14 Excel plots correspond to Table 14, the pairwise report. Excel may be slow to plot this, and may not display the legends correctly. See below how to identify points.



Bias reportable size and significance are the minimum absolute values to be reported. Only values more extreme are shown in the Tables. For "Element number order", top facet is minor, bottom facet is major.


The bias/interaction terms are computed, and Excel is launched to plot them:



Warning! Plotted interactions pruned to first 250 on Excel plot

The number of series to be plotted has been pruned to fit into Excel limits.


When "Excel plots" is checked and Microsoft Excel is available, then Excel plots are produced of the numbers reported in Tables 13 14. The direction of the measures on the plots accords with the orientation of the facets (positive or negative). These plots can be edited using all the tools of Excel.



Here is plot AM-2-1. This shows the absolute measures (measures reported in Table 7 + bias/interaction measures reported in Table 13). The measures are for the elements of Facet 2, as perceived by the elements of Facet 1. The Green circle highlights the measure for Edward (facet 2, element 5) according to Avogadro (facet 1, element 1).


Table 13.4.1  Bias/Interaction Report (arranged by mN).

Bias/Interaction: 1. Senior scientists, 2. Junior Scientists (higher score = higher bias measure)


| Obsvd    Exp.  Obsvd  Obs-Exp|  Bias  Model        |Infit Outfit|    Senior scientists  Junior Scientis |

| Score   Score  Count  Average|  Size   S.E.    t   | MnSq  MnSq | Sq N Senior sc  measr N Junior  measr |


|    36     29.2     5     1.36|    .69   .35   2.00 |   .5    .5 | 13 1 Avogadro    -.04 5 Edward    .42 |


According to Table 13, when Avogadro rated Edward, the ratings were 1.36 higher than expected, from Avogadro's perspective, Edward was .69 logits more able than his overall measure. Edward's overall measure (at the extreme right) was .42 logits. So his measure from Avogadro's perspective was .42 + .69 = 1.11 logits, as indicated by the measure on the y-axis (heavy green arrow).


Each plot has a name like "AM-1-2". "AM" identifies the plot type. The first number, "1" is the facet number of the target facet. The second number "2" is the facet number of the context facet.


The measures are shown in several plots for the target elements as perceived by the context elements:

AM: the absolute bias/interaction measures (overall measures + bias) are shown for each target element.

PM: the differences between the bias/interaction measures for each pair of target elements in a facet

AO: average observation for each target element

RM: the bias/interaction measures relative to the overall measures for each target element

PT: the t-statistic testing the hypothesis that there is no pairwise bias/interaction effect for each pair of target elements

TV: the t-statistic testing the hypothesis that there is no bias/interaction effect relative to its overall measure for each target element

Worksheet: the numbers that Excel is plotting - these can be edited as desired.


Position the mouse arrow over a point on the plot to see its details:



Excel Worksheet: This contains the plotted values. You can copy-and-paste for other uses.


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