Differences total spot, Advanced Statistics

The graphical process most frequently used in the analysis of data from a two-by-two crossover design. For each of the subject the difference between the response variable values on each treatment are plotted against the sum of the two treatment standards. The two groups corresponding to the order in which the treatments were given are differentiated on the plot by the different plotting symbols. A huge shift between the groups in the horizontal direction signifies a differential carryover effect. If this shift is small enough, then the shift between the groups in the vertical direction is a measure of the treatment effect. An instance of this type of plot can be seen in the figure drawn below.


870_difference total spot.png 


The Higher-order differences are defined by the repeated application. So, for instance, the second difference,

2119_difference total spot1.png 

 Often used in applications to achieve the stationarity prior to fitting models. 

Posted Date: 7/27/2012 3:05:37 AM | Location : United States







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