PROCIMPORT OUT=WORK.dateset

            DATAFILE="C:\Users\fchen\Desktop\data.xls"

            DBMS=EXCELREPLACE;

     RANGE="Sheet1$";

     GETNAMES=YES;

     MIXED=NO;

     SCANTEXT=YES;

     USEDATE=YES;

     SCANTIME=YES;

RUN;

data dateset;

      set dateset;

      formatDate mmddyy10.;

      run;

procsql;

    create table table1 as

    selectdistinct year(Date) asyear,count(year(date)) as daysofTm90

        fromdateset

            whereTmaxF>=90

            groupby year;

            quit;

            procsql;

            create table table2 as

            selectyear,daysofTm90,year-1960 ascenteryear,(year-1960)**2as year2,

        (year-1960)**3as year3 fromtable1;

            quit;

            procprint data=table2;

            run;

procreg data=table2;

modeldaysofTm90=centeryear year3  /clb;

title'regression analysis for degree=3 ';

run;

难道是这个proc reg本来就只能生成回归直线？曲线不行？谢谢