Author: Kanda Data
Alternative to the t-test When Data Are Not Normally Distributed
The t-test is one of the most popular methods for comparing the means of two sample groups. In practice, the t-test can be used for two paired sample groups or two independent sample groups. We can perform this difference test using a paired-samples t-test or an independent-samples t-test, depending on the characteristics of the data being analyzed.
When Should Natural Logarithmic Data Transformation Be Applied?
When researchers, practitioners, or students are conducting data analysis on research results, they are often faced with data that do not meet the assumptions required by the chosen analytical method. After testing, it may turn out that the data distribution is highly skewed, the variance is not constant, or non-linear relationships between variables are observed. These conditions represent common challenges in statistical analysis, especially when using parametric methods such as linear regression analysis.
Should Data Normality Testing Always Be Performed in Statistical Analysis?
In statistical analysis of research results, normality testing is often treated as an analytical step that is almost always conducted before proceeding to further analysis. Many researchers, students, and data practitioners believe that without a normality test, statistical analysis results become less scientific.
Differences in Nominal, Ordinal, Interval, and Ratio Data Measurement Scales for Research
In research activities, data serve as the main foundation for analysis and drawing conclusions. However, not all data have the same characteristics. One of the common challenges faced by novice researchers is understanding and applying data measurement scales. In fact, an understanding of data scales greatly determines the type of statistical analysis that can be used as well as the validity of research results.
Reasons Why the R-Squared Value in Time Series Data Is Higher Than in Cross-Section Data
If you’re doing regression analysis, R-squared is one of the most important metrics you need to understand. R-squared shows how much of the variation in the dependent variable can be explained by the variation in the independent variables in a regression model.
How to Create a Research Location Map in Excel: District, Province, and Country Maps
Creating a research location map is an important part of any research report or scientific article. A research location map helps readers understand where the study was conducted, the geographical coverage, and the area’s position. A clear visualization of the research site enhances and strengthens the presentation of research findings, especially when the study involves comparing conditions across different regions.
How to Determine the Minimum Sample Size in Survey Research to Ensure Representativeness
When conducting survey research, the number of samples observed will naturally be one of the main considerations. In survey-based studies, using samples is often a more efficient choice compared to carrying out a census on all population members. By taking a representative sample, we can observe behaviors that reflect the larger population.
Regression Analysis for Binary Categorical Dependent Variables
When we talk about regression analysis, we often think about parametric variables measured on at least an interval or ratio scale. But what if we want to analyze the effect of independent variables on a dependent variable that happens to be categorical in nature?