#Sample pspp syntax license#
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Index | Next - Independent-samples t-test For example, the local school system might want to compare standardized test scores from local students to a state or national average. For this example, the proper APA style would be t(9) =. PSPP for Beginners One-sample t-tests One-sample t-tests are used for comparing data from a sample to population data. The symbols for t and p should be in italic font. The APA style for reporting t-test statistics is t(degrees of freedom) = t score, p = probability value. Our local school kids are similar to national averages on this standardized test. In other words, our sample and the population mean are essentially the same. This difference is not statistically significant. (2-tailed) field, where "Sig." is short for statistical significance. The t-test results for the t score, degrees of freedom, and the p value are marked in green. The mean values in this example are quite similar. The one-sample t-test will compare these two means to see if these are similar or different. The means for the sample and the population are marked with blue. The output is a table with descriptive statistics and the t-test results. If no mean is given, PSPP will assume that the population mean is zero. Enter 100 in the Test Value field to represent the population mean. This is the mean that our sample will be compared to.
The second step is that we must tell PSPP the population mean value. Move this variable right to the Test Variable(s) field. The "Math Scores" label represents the OneSample variable. The first step is to choose the desired data variable from the list on the left by moving it to the Test Variable(s) field. The one-sample t-test dialog box looks like this:
#Sample pspp syntax install#
The alternative hypothesis is that they are different from the national average, being either higher or lower.īegin this analysis by going to the Analyze menu, then the Compare Means folder. Install GNU PSPP - Run PSPP - Getting Started to the User Interface - Learn Basic Navigations - First Exercise. The null hypothesis is that our local students are equal or similar to the national average. These can be compared to a national average, which we will say is 100. Let's pretend that the data in the OneSample column of the ttestExample.sav file are the standardized math test scores from 10 ninth grade students at the local high school.
This would address the question of whether local students are the same (null hypothesis) or different (alternative hypothesis, nondirectional) than the population. and i'm reading the documents online, the document says, there are some example files stored in /usr/local/share/pspp/, but i couldn't find such directory on my MacOS system.
#Sample pspp syntax mac#
For example, the local school system might want to compare standardized test scores from local students to a state or national average. where to get the examples of pspp syntax files 9 years ago Hi, As a newbee to pspp, i have installed it with mac port on my MBP. One-sample t-tests are used for comparing data from a sample to population data. PSPP for Beginners PSPP for Beginners One-sample t-tests
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