SAS Software Introduction Unit Test

• In a SAS program, how to write a comment statement?

  /…/

• In a SAS program, how to read a character variable line by line

  input x$@

• How to call key commands of hypothesis testing module in SAS program

  ttest

• In the SAS program for analysis of variance: a=1 to 4 and i=1 to 4, it should be expressed as follows

  i represents sample cycle, non-horizontal cycle, can be written as j, but a cannot

• Judgment for several SAS expressions

proc plot;                      #right
symbol i = join;            #right
model y = x no int ;
#wrong
plot x*y
#right

• In the results of regression analysis, the larger the value of R-square, the following description

拟合优度越高
点在回归直线附近越密集
变量间关系越强

• In the drawing command below, the image format generated by the mark is different from the other three items.

gplot
gchart
g3d
#plot