[求助] SAS Base Exam 一题

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The SASDATA.BANKS data set has five obs. when the following SAS program is submitted:

libnamesasdata 'SAS-date-library';

data allobs;

set sasdata.bank;

capital=0;

do year=2000 to 2020 by 5;

capital+((capital+2000)*rate);

output;

end;

How many obs.will the ALLOBS data set contain?

A. 5 B.15 C.20 D.25

I was wondering why the answer is D.25 rather than A.5???

3xxxxxx

x

[此贴子已经被作者于2007-3-7 13:54:14编辑过]

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关键词：SAS base Base Exam following Capital 求助 Exam SAS Base

Since rate has Five observations. For each observation, there are Five recycles. Then there are 5*5=25
observations.

言之有理。

how do u know rate have five obs?

3x

还是不太明白

应该运行一下吧?

The first sentence: The SASDATA.BANKS data set has five obs.

大家发表一下意见啊

运行过了，的确是25个观测。

可以认为rate是5维列向量，capital的计算式中虽然只有一个rate出现，但其实是rate的5个分量同时参与计算，因此产生了5个capital的值。从2000开始，每次加5，到2020一共有5次，所以产生了25个capital的观测。