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SPSS and Minitab use aggregate data to do t-test. I believe many inexperienced people don't know what to do about it. Therefore, this paper summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

The calculation formula of t-test is very simple. Enter the formula in Excel to get the t-value. Then the corresponding P value can be queried with the t boundary value table. However, the formula can only be used to calculate the t value when the two groups of variances are homogeneous. If the two groups of variances are uneven and need to be tested by t 'test, the formula becomes more complicated. However, netizens don't have to worry. SPSS 23.0 adds an independent sample t-test for aggregating data.

1. Independent sample t-test function of SPSS 23.0 aggregate data

1. Step: click the [analyze] → [compare average] → [Abstract Independent sample T Test] menu.

Take the "physiological" score as an example: you only need to compare the sample size, mean and standard deviation of the two sets of data.

2. Results

Whether it is t test or t 'test, the t value is about 3.7. it is obvious that 7.508 in the literature is wrong.

In addition to this function of SPSS 23.0, Minitab can also easily perform independent sample t-test of aggregate data.

2. Independent sample t-test function of Minitab summary data

1. Step: click * * Statistics * * → * * basic Statistics * * → * * double sample t * menu.

2. Results

Obviously, this result is the same as that of the t 'test in SPSS (assuming the variance is uneven), but what if we assume that the two sets of data are homogeneous? This can be done simply by selecting assume equivariance in the options dialog box.

3. Suppose the result of homogeneity of variance

At this point, netizens may ask again, the above two methods do not test the homogeneity of variance, so should we read the results of t-test or t 'test? In fact, don't worry at all, Minitab can also test the variance homogeneity of aggregate data.

3. Independent sample t-test function of Minitab summary data

1. Step: click * * Statistics * * → * * basic Statistics * * → * * difference * * menu.

After reading the above, have you mastered the method of t-test of SPSS and Minitab with aggregate data? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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