This tutorial includes the formula and examples for Sum of Squares (SS). Sum of Squares (SS) is a measure of deviation from the mean and the following is its formula. It is to square the distance between each data point and the mean then add them together. Formula of Sum of Squares (SS) The following is … Read more
The main difference between interval and ratio data lies in the presence or absence of a meaningful zero point and the nature of the numerical values. Interval Data Interval data is a type of quantitative data where the intervals between values are equal and consistent. It has a numerical scale that represents the magnitude of … Read more
Likert scales are widely used in surveys and questionnaires to assess respondents’ attitudes, opinions, or perceptions. However, there has been ongoing debate regarding whether Likert scales should be classified as ordinal data or interval data. This tutorial aims to explore the nature of Likert scales and provide insights into their appropriate treatment in statistical analysis. … Read more
There are 3 assumption for ANOVA: Normality – The responses for each factor level have a normal population distribution. Equal variances (Homogeneity of Variance) – These distributions have the same variance. Independence – The data are independent. You can use R to test the assumptions of normality and equality variances (The following are the two tutorials). In contrast, … Read more
In some situations, the syntax is easier than the visual menu to use in SPSS. This tutorial provides examples of syntax for chi-square test in SPSS. 2 Examples of Syntax for chi-square test in SPSS Example 1: One variable The first example is the one variable chi-square test. The following is example data for one … Read more
This tutorial shows how you can do one variable chi-square in SPSS with detailed examples. The following shows two examples, one using Syntax and one using a menu interface. Examples of One Variable Chi-Square in SPSS Example 1 A school is offering 3 courses, and you would like to see whether the number of students … Read more
This tutorial shows how you can do logistic regression in SPSS step by step. Logistic regression is a model testing the relationship between Y (which is a binary variable) and X (X can be more than one). logistic regression is also called logit regression. In this tutorial, we are going to use a dataset posted on the UCLA … Read more
This tutorial shows how to do multiple linear regression in SPSS. Different from simple linear regression, multiple linear regression has more than 2 or more independent variables (i.e., multiple Xs). In this tutorial, we test if students’ writing scores and math scores can be used to predict reading scores. Read = b0 + b1 Write + b2 Math … Read more
This tutorial shows how to do simple linear regression in SPSS step by step. Simple linear regression estimates the linear relationship between one independent variable and one dependent. In this tutorial, we test whether students’ writing scores can be used to predict reading scores. Read = b0 + b1 Write This dataset in this tutorial … Read more
This tutorial shows how to add label values via SPSS syntax. Such label values can tell readers what these numbers actually represent. In SPSS, you can use the menu to add label values (see the window below). However, you can also achieve the same results by using syntax. Add Label Values via SPSS Syntax The … Read more