跟crackman读SAS文献（3）--2《SAS程序在随机化实验设计中的应用》

shiyiming

From crackman's blog on Baidu


               
                <p>这个是拉丁方设计的一个实例：处理组(tnltS)K=4，分别为0，100，200<br>
和300，在4个试验室(Lab)、4天(Day)完成，试作拉丁方设计。</p>
<p>title 'latin square design';<br>
proc plan seed=37430;<br>
factors rows=4 ordered cols=4 ordered/noprint;<br>
<strong><font style="background-color: #ffff00">treatments tmts=4 cyclic;<br>
</font></strong>output out=g<br>
rows <strong><font style="background-color: #ffff00">cvals</font></strong>=('day1' 'day2' 'day3' 'day4') random<br>
cols cvals=('lab1' 'lab2' 'lab3' 'lab4') random<br>
tmts <font style="background-color: #ffff00"><strong>nvals</strong></font>=(0 100 250 450) random;<br>
quit;<br>
proc tabulate;<br>
class rows cols;<br>
var tmts;<br>
table rows,cols*(tmts*f=6.)/rts=8;<br>
run;</p>
<p>最关键的是注意三个黄色背景的区域</p>
<p>关于CVALS和NVALS的解释：</p>
<p>有点类似LABEL标签一样，C开头是字符型的，N开头是数值型的</p>
<dt><strong>NVALS=</strong> </dt><dd>
<p>lists <img style="width: 7px; height: 7px; vertical-align: 0px" class="math gen" src="http://hiphotos.baidu.com/crack%5Fman/pic/item/ac94053783e76bb21b4cff82.jpg"> numeric values for the factor. By default, the procedure uses NVALS=(1 2 3 <img style="width: 23px; height: 7px; vertical-align: 0px" class="math gen" src="http://hiphotos.baidu.com/crack%5Fman/pic/item/40b0e2fc1cefd145d8f9fd82.jpg">).</p>
</dd><dt><strong>CVALS=</strong> </dt><dd>
<p>lists <img style="width: 7px; height: 7px; vertical-align: 0px" class="math gen" src="http://hiphotos.baidu.com/crack%5Fman/pic/item/6ef5450cb7a49ddf0b7b8282.jpg"> character strings for the factor. Each string can have up to 40 characters, and each string must be enclosed in quotes. <strong>Warning</strong>:When you use the CVALS= option, the variable created in the output data set has a length equal to the length of the longest string given as a value; shorter strings are padded with trailing blanks. For example, the values output for the first level of a two-level factor with the following two different specifications are not the same.</p>
<div class="pre">
<pre class="sascode">CVALS=('String 1' &quot;String 2&quot;)

CVALS=('String 1' &quot;A longer string&quot;)</pre>
</div>
<p>The value output with the second specification is &rsquo;String 1&rsquo; followed by seven blanks. In order to match two such values (for example, when merging two plans), you must use the TRIM function in the DATA step (see <em>SAS Language Reference: Dictionary</em>).</p>
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