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PEAKS OF FREQUENCY TABLEName:
Peaks are determined as follows:
Also, you can specify that relative frequencies rather than counts be computed. The command
can be used to specify whether relative frequencies are computed so that the area sums to 1 or so that frequencies sum to 1. The first option, which is the default, is useful for when using the relative binning as an estimate of a probability distribution. The second option is useful when you want to see what percentage of the data falls in a given class.
<SUBSET/EXCEPT/FOR qualification> where <y> is the response variable; <y2> is a variable where the computed counts (or frequencies) are stored; <x2> is a variable where the computed bin mid-points are stored; and where the <SUBSET/EXCEPT/FOR qualification> is optional. This syntax is used for the case where the frequencies are expressed as raw counts.
<SUBSET/EXCEPT/FOR qualification> where <y> is the response variable; <y2> is a variable where the computed counts (or frequencies) are stored; <x2> is a variable where the computed bin mid-points are stored; and where the <SUBSET/EXCEPT/FOR qualification> is optional. This syntax is used for the case where the frequencies are expressed as relative frequencies.
LET Y2 X2 = PEAKS OF FREQUENCY TABLE Y SUBSET TAG > 2 LET Y2 X2 = RELATIVE PEAKS OF FREQUENCY TABLE Y
By default, DATAPLOT uses a class width of 0.3 times the standard deviation of the variable. A number of alternative choices for class width can be set with the command
Enter HELP HISTOGRAM CLASS WIDTH for details.
let u1 = 0 let sd1 = 1 let u2 = 5 let sd2 = 3 let p = 0.6 let y = normal mixture rand numb for i = 1 1 500 . set write decimals 4 let y2 x2 = binned y print x2 y2 . let y3 x3 = peaks of frequency table y print x3 y3 . xlimits -5 15 histogram y . line color blue line dash line thickness 0.2 let ycoor1 = 0 let npeak = size x3 . loop for k = 1 1 npeak let xtemp = x3(k) let ytemp = y3(k) drawdata xtemp ycoor1 xtemp ytemp end of loopThe following output is generated. VARIABLES--X2 Y2 -4.0351 1.0000 -3.0993 2.0000 -2.1636 10.0000 -1.2278 51.0000 -0.2921 112.0000 0.6437 103.0000 1.5795 41.0000 2.5152 24.0000 3.4510 27.0000 4.3868 19.0000 5.3225 29.0000 6.2583 23.0000 7.1941 22.0000 8.1298 17.0000 9.0656 7.0000 10.0014 7.0000 10.9371 3.0000 11.8729 2.0000 VARIABLES--X3 Y3 -0.2921 112.0000 3.4510 27.0000 5.3225 29.0000
Date created: 1/26/2009 |