How to Calculate the Standard Deviation and Variance in SPSS
54.5 هزار بار بازدید -
12 سال پیش
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Calculate the Standard Deviation, Variance,
Calculate the Standard Deviation, Variance, and other Measures of Variability in SPSS.
Video Transcript: In this tutorial, we'll look at how to obtain the measures of variability on a variable, and in particular we'll obtain the standard deviation, the variance, the minimum, maximum, and the range. We have the variable, exam score, in this example, where we have 15 people who each provided an exam score. So we have the exam scores for 15 different people. Now let's go ahead and go to Analyze and then Descriptive Statistics now we can actually either use Frequencies or Descriptives to obtain the measures of variability that we're interested in. Let's go ahead and start with Descriptives. OK we move our variable over and then go to Options and here let's deselect Mean, because we don't need that. Notice under Dispersion, Standard Deviation, Minimum and Maximum are already checked, Variance and Range are not. So let's go ahead and check the Variance and the Range. That's everything we want, so click Continue and then click OK. And our output window opens and we have the output there. And notice in this table we have the variable exam score, we have 15 values, as we already saw, the range is 39, the range is the highest score minus the lowest score. The minimum value is 58 the maximum is 97. Rounding to two decimal places, the standard deviation is 11.32, and the variance is 128.12. Before we close here, let's go back and this time and run the analysis through frequencies. So we'll go to our data. We're going to run the analysis on this variable over again. Go to Statistics and then notice here we have Dispersion. Now we want to select all of these values, with the exception of the last one; let's not select the standard error of the mean. Click Continue. Deselect this checkbox here, so the frequency tables are not displayed, and then click OK. Alright we get our new output and this table, notice that we have virtually the same information with one very slight difference. Here we have missing reported, which is zero, meaning we had no missing values, or we have values for every single person in our data. Otherwise we have the standard deviation and variance, although they are reported in a different order for Frequencies vs Descriptives, the same values are here 11.32, we saw 11.32 here, the variance is the same, we have our Minimum and Maximum of 58, 97, and then the range is 39. OK so that's it. You can obtain measures of variability using either approach, whichever one you prefer. This concludes the tutorial on obtaining measures of variability in SPSS.
Lifetime access to SPSS videos: http://tinyurl.com/kuejrzz
YouTube Channel: statisticsinstructor
Channel Description: For step by step help with statistics, with a focus on SPSS. Both descriptive and inferential statistics covered. For descriptive statistics, topics covered include: mean, median, and mode in spss, standard deviation and variance in spss, bar charts in spss, histograms in spss, bivariate scatterplots in spss, stem and leaf plots in spss, frequency distribution tables in spss, creating labels in spss, sorting variables in spss, inserting variables in spss, inserting rows in spss, and modifying default options in spss. For inferential statistics, topics covered include: t tests in spss, anova in spss, correlation in spss, regression in spss, chi square in spss, and MANOVA in spss. New videos regularly posted. Videos series coming soon include: multiple regression in spss, factor analysis in spss, nonparametric tests in spss, multiple comparisons in spss, linear contrasts in spss, and many more. Subscribe today!
YouTube Channel: statisticsinstructor
Lifetime access to SPSS videos: http://tinyurl.com/m2532td
Video Transcript: In this tutorial, we'll look at how to obtain the measures of variability on a variable, and in particular we'll obtain the standard deviation, the variance, the minimum, maximum, and the range. We have the variable, exam score, in this example, where we have 15 people who each provided an exam score. So we have the exam scores for 15 different people. Now let's go ahead and go to Analyze and then Descriptive Statistics now we can actually either use Frequencies or Descriptives to obtain the measures of variability that we're interested in. Let's go ahead and start with Descriptives. OK we move our variable over and then go to Options and here let's deselect Mean, because we don't need that. Notice under Dispersion, Standard Deviation, Minimum and Maximum are already checked, Variance and Range are not. So let's go ahead and check the Variance and the Range. That's everything we want, so click Continue and then click OK. And our output window opens and we have the output there. And notice in this table we have the variable exam score, we have 15 values, as we already saw, the range is 39, the range is the highest score minus the lowest score. The minimum value is 58 the maximum is 97. Rounding to two decimal places, the standard deviation is 11.32, and the variance is 128.12. Before we close here, let's go back and this time and run the analysis through frequencies. So we'll go to our data. We're going to run the analysis on this variable over again. Go to Statistics and then notice here we have Dispersion. Now we want to select all of these values, with the exception of the last one; let's not select the standard error of the mean. Click Continue. Deselect this checkbox here, so the frequency tables are not displayed, and then click OK. Alright we get our new output and this table, notice that we have virtually the same information with one very slight difference. Here we have missing reported, which is zero, meaning we had no missing values, or we have values for every single person in our data. Otherwise we have the standard deviation and variance, although they are reported in a different order for Frequencies vs Descriptives, the same values are here 11.32, we saw 11.32 here, the variance is the same, we have our Minimum and Maximum of 58, 97, and then the range is 39. OK so that's it. You can obtain measures of variability using either approach, whichever one you prefer. This concludes the tutorial on obtaining measures of variability in SPSS.
Lifetime access to SPSS videos: http://tinyurl.com/kuejrzz
YouTube Channel: statisticsinstructor
Channel Description: For step by step help with statistics, with a focus on SPSS. Both descriptive and inferential statistics covered. For descriptive statistics, topics covered include: mean, median, and mode in spss, standard deviation and variance in spss, bar charts in spss, histograms in spss, bivariate scatterplots in spss, stem and leaf plots in spss, frequency distribution tables in spss, creating labels in spss, sorting variables in spss, inserting variables in spss, inserting rows in spss, and modifying default options in spss. For inferential statistics, topics covered include: t tests in spss, anova in spss, correlation in spss, regression in spss, chi square in spss, and MANOVA in spss. New videos regularly posted. Videos series coming soon include: multiple regression in spss, factor analysis in spss, nonparametric tests in spss, multiple comparisons in spss, linear contrasts in spss, and many more. Subscribe today!
YouTube Channel: statisticsinstructor
Lifetime access to SPSS videos: http://tinyurl.com/m2532td
12 سال پیش
در تاریخ 1391/12/18 منتشر شده
است.
54,534
بـار بازدید شده