Bland-Altman Analysis
Bland-Altman Analysis is one of the statistical analyses applied automatically in MerQur. This page illustrates — on a Natural Sciences & Mathematics sample dataset — how the analysis is run, what the MerQur output looks like, and how the result is reported in APA 7 format.
🎯 What is it for?
Bland-Altman Analysis automatically performs all required 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 in the APA 7 standard, effect sizes such as Cohen’s d/η²/R², and 95% confidence intervals are reported.
📌 When is it used?
- Statistical analysis of measurements in the Natural Sciences & Mathematics domain
- To produce APA 7-compatible result tables for academic publications
- Hypothesis testing and decision-making processes
- Undergraduate / master’s / PhD theses after the appropriate method has been selected
📐 Assumptions
- Appropriate scale — Variables must be at the measurement level required by the analysis (nominal/ordinal/interval/ratio)
- Independent observations — Observations must come from individuals independent of one another
- Sufficient sample size — The minimum n requirement for the analysis must be met
- Outlier check — Outliers must be detected and evaluated
If assumptions are violated, MerQur automatically suggests a non-parametric or robust alternative.
🛠 How to do it in MerQur
Load the data. Select the sample file from File → Open. MerQur auto-detects column types.
Select the analysis. From the left side select Bland-Altman Analysis.
Panel assignments (form fields in the program):
- method1_col:
ornek_id - method2_col:
cihaz_A_olcum
Optional settings. Effect size ✓ · 95% confidence interval ✓ · Assumption checks (automatic).
▶ Run — click the button. Results are produced automatically as a table + chart.
📄 Export to Word. APA 7-formatted report with italic statistical symbols.
📊 Sample Dataset — Natural Sciences & Mathematics
ℹ Note: The scenario, MerQur output and interpretation below were produced by actually running the real example dataset in MerQur. Numeric results on your own data will differ; the goal is to show how the analysis is set up and interpreted end-to-end.
🎬 Example File
This analysis is demonstrated on the following example dataset for Natural Sciences & Mathematics:
Fen_Matematik/34_bland_altman_device.xlsx
🎬 Scenario
We examine the agreement of two devices measuring the same quantity. For device interchangeability, Bland-Altman is appropriate.
⚙️ Variable Selection
- 1st measure / group: device_A_measurement
- 2nd measure / group: device_B_measurement
Data Preview (First 5 Rows)
| sample_id | device_A_measurement | device_B_measurement |
|---|---|---|
| 1.0 | 66.0 | 58.22 |
| 2.0 | 41.11 | 39.82 |
| 3.0 | 43.71 | 35.52 |
| 4.0 | 52.11 | 50.62 |
| 5.0 | 44.99 | 43.38 |
n = 60 · Columns: sample_id, device_A_measurement, device_B_measurement
📈 MerQur Output
💬 Interpretation
We examined how well two devices measuring the same quantity (device_A vs device_B) agree: the mean systematic difference (bias) is ~1.5 units, and 95% limits of agreement were reported. Unlike correlation, Bland-Altman answers “can the two devices be used interchangeably?” — high correlation does not mean agreement, there may be a systematic shift. In the lab it is the standard method for testing the interchangeability of two measuring instruments/methods.
⚠ Common Mistakes
- Misidentifying the data type (e.g., loading a categorical variable as numeric)
- Skipping assumption checks and going straight to the p-value
- Failing to report effect size — APA 7 requires both p and effect size
- Failing to apply a Type I error correction (Bonferroni/Tukey) in multiple comparisons
- Not switching to a non-parametric alternative when n is insufficient
📹 Video Walkthrough
Watch the video below for an end-to-end walkthrough of this analysis on a Natural Sciences & Mathematics file.
▶ Bland-Altman Analysis — video walkthrough
This section is part of the İlişki ve Korelasyon video (6 analyses in one video). The link below jumps straight to 2:03, where this analysis begins. Narration is in Turkish.
🎓 Education Sciences · 🏛 Architecture, Planning & Design · ⚙ Engineering · 🏥 Health Sciences · 📊 Social, Humanities & Admin Sciences · 🏃 Sport Sciences · 🌾 Agriculture, Forestry & Aquatic
📚 If You Used This Analysis, Cite MerQur
If you performed this analysis using MerQur in a scientific study, please use the citation below as part of your academic citation obligations (APA 7):
Örücü, Ö. K. (2026). MerQur: Integrated Academic Data Analysis & Reporting Platform [Computer software] (Version 1.0.0). https://doi.org/10.53463/merqur.2026001
For BibTeX, RIS, EndNote and the English citation form: 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.