Lesson 4 统计描述及分布类型

统计描述

proc means

proc means过程：均值、标准差、标准误、方差、变异系数、极差、t值、偏度系数、峰度系数、可信区间上下限。

data a;
set ysc.anemia;
run;
proc means data=a;
var age1 hb;
run;
-----------------------------
proc means data=a maxdec=3 mean range clm alpha=0.05;
/*maxdec小数位数为3*/
var age1 hb;
class sex;
run;
-----------------------------
proc sort data=a;
by sex; run;
proc means data=a maxdec=3 mean range clm alpha=0.05;
var age1 hb; by sex; run;

proc univariate

proc univariate过程：极端值的描述、分位数的计算、生成分布图、生成频数表、正态性检验

选项有：ALL, ALPHA, ANNOTATE, CIBASIC, CIPCTLDF, CIPCTLNORMAL, CIQUANTDF, CIQUANTNORMAL, DATA, DEBUG, EXCLNPWGT, FREQ, GOUT, LOCCOUNT, MODE, MODES,MU0, NEXTROBS, NEXTRVAL, NOBYPLOT, NOPRINT, NORMAL, NOTABCONTENTS, NOVARCONTENTS,OUTTABLE, PCTLDEF, PLOT, PLOTSIZE, ROBUSTSCALE, ROUND, SUMMARYCONTENTS, TRIMMED,VARDEF, WINSORIZED.

proc univariate data=a;
var age1;
run;

proc freq

proc freq data=a;
tables sex anemia_ana;
run;
proc freq data=a;
tables sex*anemia_ana;
run;

正态分布检验

/*绘制直方图*/
proc gchart data=ysc.anemia;
title1 'histogram';
pattern color=black value=empty;
vbar age1 hb;
run;
/*正态性检验*/
proc univariate data=ysc.anemia normal;
vbar age1 hb;
run;