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1、用 SPSS 进行数据的对数转换至正态用 SPSS 进行数据的对数转换 至正态 (2011-10-30 16:53:44) 转载标签： spss 对数转换 正态分布 杂谈Transforming Data in SPSSIn this guide we will enter some data and then perform a transformation of the data. Transforming data is performed for a whole host of different reasons but one of the most common is to app
2、ly a transformation to data that is not normally distributed so that the new, transformed data is normally distributed. Transforming a non-normal distribution into a normal distribution is performed in a number of different ways depending on the original distribution of data but a common technique i
3、s to take the log of the data. In this example we will show you howSPSS allows you to do this.There are an infinite possible ways to tranform data, although there are some approaches that are much more common than others. We will add extra examples of transforming data in the near future.Data to Tra
4、nsform36324541292218361040Your data should end up looking like the following: Remember that each individuals results go on a separate line (row) in SPSS.至正态 border=0 alt=Transforming Data in SPSS src=321/19247336_2.gif width=219 height=363Published with written permission from SPSS Inc, an IBM Compa
5、ny.Rename the variable Data instead of the default VAR00001. You can name it something else if you wish. Click on Transform > Compute Variable. in the top menu.至正态 border=0 alt=Transforming Data in SPSS src= 321/19247336_3.gif width=308 height=152 real_src= 11/1321/19247336_3.gifPublished with wr
6、itten permission from SPSS Inc, an IBM Company.You need to first select the function you would like to use.To do this click All in the Function group: box then scroll down in the Functions and Special Variables: box and click Lg10 to select it.Transfer the Lg10 function into the Numeric Expression:
7、box by pressing thebutton.Click the Data variable in the lefthand box and then click the button which will result in the expression you see in the Numeric Expression: box below.All to do now is to give this new variable a name. We have called the new variable TrData. Type this name into the Target V
8、ariable: box in the top lefthand corner. 至正态 border=0 alt=Transforming Data in SPSS src= 321/19247336_6.gif width=590 height=495 real_src= 11/1321/19247336_6.gifPublished with written permission from SPSS Inc, an IBM Company.Click on the button.You will be presented with the SPSS Data Editor which will now show the log transformed data under the new variable name TrData that you defined.至正态 border=0 alt=Transforming Data in SPSS src= 321/19247336_8.gif width=351 height=376 real_src= 11/1321/19247336_8.gifPublished with written permission from SPSS Inc, an IBM Company.
