
AAD TO MEDIANName:
where AAD and \( \tilde{x} \) denote the average absolute deviation and the median, respectively. This is the statistic computed by this command. Note that the AAD used here is defined as
That is, we compute the deviations from the median rather than the mean. This statistic is a robust alternative to the coefficient of variation.
<SUBSET/EXCEPT/FOR qualification> where <y> is a response variable; <par> is a parameter where the AAD TO MEDIAN value is saved; and where the <SUBSET/EXCEPT/FOR qualification> is optional.
<SUBSET/EXCEPT/FOR qualification> where <y1> is the first response variable; <y2> is the second response variable; <par> is a parameter where the AAD TO MEDIAN value is saved; and where the <SUBSET/EXCEPT/FOR qualification> is optional.
LET D = AAD TO MEDIAN Y1 SUBSET TAG > 2
LET D = DIFFERENCE OF AAD TO MEDIAN Y1
LET Y1 = DOUBLE EXPONENTIAL NUMBERS FOR I = 1 1 100 LET D = AAD TO MEDIAN Y1Program 2: . Step 1: Create the data . skip 25 read gear.dat y x skip 0 set write decimals 6 . . Step 2: Define plot control . title case asis title offset 2 label case asis . y1label Coefficient of Dispersion (AAD to Median) x1label Group title AAD to Median for GEAR.DAT let ngroup = unique x xlimits 1 ngroup major x1tic mark number ngroup minor x1tic mark number 0 tic mark offset units data x1tic mark offset 0.5 0.5 y1tic mark label decimals 3 . character X line blank . set statistic plot reference line average aad to median plot y x . tabulate aad to median y x Cross Tabulate AAD TO MEDIAN (Response Variables: Y )  X  AAD TO MEDIAN  1.000000  0.003405 2.000000  0.003704 3.000000  0.002811 4.000000  0.003210 5.000000  0.006134 6.000000  0.007419 7.000000  0.005497 8.000000  0.002800 9.000000  0.003106 10.000000  0.003815Program 3: SKIP 25 READ IRIS.DAT Y1 TO Y4 X . LET A = DIFFERENCE OF AAD TO MEDIAN Y1 Y2 SET WRITE DECIMALS 4 TABULATE DIFFERENCE OF AAD TO MEDIAN Y1 Y2 XCross Tabulate DIFFERENCE OF AAD TO MEDIAN (Response Variables: Y1 Y2 )  X  DIFFERENCE OF A  1.0000  0.0295 2.0000  0.0181 3.0000  0.0036. XTIC OFFSET 0.2 0.2 X1LABEL GROUP ID Y1LABEL DIFFERENCE OF AAD TO MEDIAN CHAR X LINE BLANK DIFFERENCE OF AAD TO MEDIAN PLOT Y1 Y2 X  
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Date created: 01/24/2017 