The OBS= data set option enables you to select observations from SAS data sets. You can select observations to be read from external data files by using the OBS= option in the INFILE statement.

OBS= tells SAS when to stop processing observations or records. To determine when to stop processing, SAS uses the value for OBS= in a formula that includes the value for OBS= and the value for FIRSTOBS=.

2020年11月22日 · As discussed above, you can use the OBS=-option to specify the last observation that SAS processes from a data set. In contrast, you can use the FIRSTOBS= -option to specify the first observation that SAS processes.

2020年1月2日 · set sashelp.class (firstobs=3 obs=6 keep=name age sex); 这样不会引起冗余读入。 以下是非数据集选项，即不带括号的options nobs=变量，将数据集观测数传给临时变量（非输出变量） data n_obs; if 0 then set sashelp.class nobs=total_obs; total=total_obs; output; …

OBS= tells SAS when to stop processing observations. To determine when to stop processing, SAS uses the value for OBS= in a formula that includes the value for OBS= and the value for FIRSTOBS=. For example, if OBS=10 and FIRSTOBS=1 (which is the default for FIRSTOBS=), the result is 10 observations. That is, (10 - 1) + 1 = 10.

The SET statement's OBS= option tells SAS to stop reading the data from the input SAS data set at the line number specified by OBS. We'll start by using the OBS= option to create the data set that we'll be working with throughout this lesson.

2024年10月22日 · OBS= tells SAS when to stop processing rows or records. To determine when to stop processing, SAS uses the value for OBS= in a formula that includes the value for OBS= and the value for FIRSTOBS=. Here is the formula:

2011年10月3日 · You can use the OBS= system option to limit the number of records that SAS will process. Setting OBS=10 will limit the processing to the first 10, then set it back to OBS=MAX so subsequent operations consider the full data. options obs=10; proc import datafile="G:\Departments\Research\MAP\1112\Oconee - &admin.

2013年12月18日 · [SAS] 使用OBS=指令取出部分数据. 今日主题是SAS的「OBS=」以及「FIRSTOBS=」这两个指令。 适用于什么场合呢？ 可以用在当研究者想要浏览数据中的一部分时。 什么意思呢？ 请看今天的范例数据(如下)。 现在有一个数据，内有10个观察值，分别有ID、 Rainfall、Wind、Temperature等四个变量。 而这个数据我已经倒入到SAS环境，名称为Bean。 http://s6/mw690/001m7RqPty6F5wlJfKZ45&690 使用OBS=指令取出部分数据" TITLE=" [SAS] …

2019年10月9日 · Better solution is to figure out the total number of observations in your data using proc contents. Then in proc print use firstobs=number of obs - 10 instead of obs=10.