Step 1: Calculate the differences and averages. (Actually the differences are used in the plot of identity above) using this code:

DATA BA;
input large mini;
diff=large-mini;
avg=(large+mini)/2;
datalines;
… data follow…

Step 2: Specify values for the x and y axes for the plot, and this is done with macro variables in the following code:

%let minx=100;%let maxx=700;%let tickx=50;
The “tick” variable specifies how often ticks will appear on the axis. For the X axis the minimum and maximum should reflect values that fully encompass the values of the original data (mini and large in this case.)


Step 3: Create necessary information to produce the mean line at 0 using the information in the “anno” data set shown below:

data anno;
   function='move'; xsys='1'; ysys='1'; x=0; y=0; output;
   function='draw'; xsys='1'; ysys='1'; color='red'; x=100; y=100; size=2;

output;

run;

Step 4: The plot of identity is produced using this code (using calculated upper and lower bound previously created.)

symbol1
i=none v=dot c=black height=1;

* X AXIS - HORIZONTAL;

axis1
length=6.5 in width=1


value=(font="Arial"
h=1) order=&minx to &maxx by &tickx;

* YAXIS - VERTICAL;

axis2
length=4.5 in width=1


value=(font="Arial"
h=1) order=&minx to &maxx by &tickx;

footnote ;

proc
gplot
data=PERF;

plot large*mini /
haxis=axis1 vaxis=axis2

vref= (&blower &bupper &bmeandiff) cvref=red;
run;

正在学习。

如何给这几个线加上label或图例说明呢？

在系统自带的画图程序里再二次操作吧

做不出来，好像程序有点小问题