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We will use the hsb2.sav data file for our Step 3 : Interpret the data and describe the histogram's shape. When the y-axis is labeled as "count" or "number", the numbers along the y-axis tend to be discrete positive integers. . Normal Distribution (Bell Curve) | Definition, Examples, & Graph How do you interprete Kurtosis and Skewness value in SPSS output file The basic histogram command works with one variable at a time, so pick one variable from the selection list on the left and move it into the Variable box. Each as shown below. Assess how the sample size may affect the appearance of the histogram. Assessing Normality: Histograms vs. Normal Probability Plots Simply type =norm.dist(a,b,c,true) about the center of the histogram, it is skewed. Descriptive Stats for One Numeric Variable (Frequencies) - SPSS If a data set does turn out to be skewed (or close to it), make sure to denote the direction of the skewness (left or right). Some processes will naturally have a skewed distribution, and may also be bounded. By entering your email address and clicking the Submit button, you agree to the Terms of Use and Privacy Policy & to receive electronic communications from Dummies.com, which may include marketing promotions, news and updates. The majority of the data is just above zero, so there Probability density curve for our distribution . If it appears skewed, you should understand the cause of this behavior. to Thus, the independent variable is the days of the week and the dependent variable is the number of tickets sold on each day. Descriptive Statistics on SPSS: Step by Step with Interpretation For information on how to specify different distributions and parameters, go to Fitted distribution lines. Stem This is the stem. The following two examples will use these steps and definitions to demonstrate how to interpret a histogram. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. Normal Distribution (Statistics) - The Ultimate Guide - SPSS tutorials Skewness indicates that the data may not be normally distributed. In SPSS, we can very easily add normal curves to histograms. A histogram is bell-shaped if it resembles a bell curve and has one single peak in the middle of the distribution.