Kruskal-Wallis Testi
The Kruskal-Wallis Test is one of the statistical analyses automatically performed in MerQur. This page illustratively demonstrates, using a sample dataset from the field of Agriculture, Forestry and Aquaculture, how the analysis is applied, how the MerQur output appears, and how it is reported in APA 7 format.
🎯 What is it for?
The Kruskal-Wallis Test automatically performs all necessary assumption checks (normality, homogeneity of variance, etc.) for the relevant data type in the background and presents the results with a clear table + chart. Automatic interpretation to the APA 7 standard, effect sizes such as Cohen’s d/η²/R², and 95% confidence intervals are reported.
📌 When is it used?
- In the statistical analysis of measurements belonging to the Agriculture, Forestry and Aquaculture field
- To produce APA 7 compliant result tables for academic publication
- In hypothesis testing and decision-making processes
- After selecting an appropriate method in undergraduate / master’s / doctoral theses
📐 Assumptions
- Appropriate scale — Variables must be at the scale level required by the analysis (nominal/ordinal/interval/ratio)
- Independent observations — Observations must come from mutually independent individuals
- Adequate sample — The minimum n requirement for the analysis must be met
- Outlier check — Outliers must be detected and evaluated
If the assumptions are violated, MerQur automatically steers you toward a non-parametric or robust alternative.
🛠 How to do it in MerQur
Load the data. Select the sample file from the File → Open menu. MerQur automatically detects column types.
Select the analysis. Choose Kruskal-Wallis Test from the left sidebar.
Panel assignments (form fields in the program):
- Group Column:
toprak_tipi - Value Column:
yillik_gelisim_cm
Optional settings. Effect size ✓ · 95% confidence interval ✓ · Assumption checks (automatic).
Press the ▶ Run button. Results are generated automatically as a table + chart.
📄 Export to Word. A report in APA 7 format with italic statistical symbols.
📊 Sample Dataset — Ziraat, Orman ve Su Ürünleri
ℹ Note: The MerQur output and interpretation tables on this page are illustrative and intended to help understand the analysis. The numerical results for your own data may differ; this page does not have to match the YouTube video walkthrough exactly.
🎬 Example File Used in the Video
The YouTube video walkthrough of this page was recorded using the sample file below for the Agriculture, Forestry and Aquaculture field:
MerQur_Hoca_Tanitim/Ziraat_Orman_Su/16_kruskal_wallis_toprak_gelisim.xlsx
Data Preview (First 5 Rows)
| parsel_id | toprak | verim_ton_ha |
|---|---|---|
| 1 | Kil | 5.50 |
| 2 | Kil | 5.30 |
| 3 | Kil | 1.46 |
| 4 | Kil | 3.04 |
| 5 | Kil | 3.20 |
n = 45 · Sütunlar: parsel_id, toprak, verim_ton_ha
MerQur Output (Illustrative)
MerQur Interpretation (Plain Language)
The Kruskal-Wallis Test showed that the effect of the toprak levels on verim_ton_ha is significant (p < .001, η²p = .31, medium-to-large effect). Tukey HSD post-hoc comparisons determine between which groups a significant difference exists.
APA 7 Interpretation (Academic Format · Illustrative)
toprak variable has a significant effect on verim_ton_ha, F(2, 42) = 24.82, p < .001, η²p = .31. The effect size is at a medium-to-large level according to Cohen’s (1988) criteria. Tukey HSD post-hoc comparisons revealed the significant differences between the groups.⚠ Common Mistakes
- Specifying the data type incorrectly (e.g., loading a categorical variable as numeric)
- Skipping the assumption checks and looking directly at the p-value
- Not reporting the effect size — APA 7 requires both p and the effect size
- Not applying a Type I error correction (Bonferroni/Tukey) in multiple comparisons
- Not switching to a non-parametric alternative when n is insufficient
📹 Video Walkthrough
You can watch the video below for an end-to-end application of this analysis using the Agriculture, Forestry and Aquaculture file.
🎓 Educational Sciences · 🧪 Natural Sciences and Mathematics · 🏛 Architecture, Planning and Design · ⚙ Engineering · 🏥 Health Sciences · 📊 Social, Humanities and Administrative Sciences · 🏃 Sport Sciences
📚 If You Used This Analysis, Cite MerQur
If you performed this analysis in a scientific study using MerQur, please use the following citation (APA 7) in accordance with the academic citation requirement:
Örücü, Ö. K. (2026). MerQur: An Integrated Academic Data Analysis and Reporting Platform [Computer Software] (Version 1.0.0). https://doi.org/10.53463/merqur.2026001
For BibTeX, RIS, EndNote and the English equivalent: all citation formats →
- American Psychological Association. (2020). Publication manual of the American Psychological Association (7th ed.).
- Field, A. (2018). Discovering statistics using IBM SPSS Statistics (5th ed.). Sage.
- Cohen, J. (1988). Statistical power analysis for the behavioral sciences (2nd ed.). Lawrence Erlbaum.