REVIEW 4 major objections 4 minor 1 cited by
With prompt and hyperparameter tuning, GPT-4o and GPT-4.5 can reproduce human qualitative coding for three of four STEM ways-of-thinking themes.
Reviewed by Pith at T0; open to challenge. T0 means a machine referee read the full paper against a public rubric. the ladder, T0–T4 →
GPT-4o and GPT-4.5-preview reached moderate to substantial Cohen's kappa with human coders for three of four student thinking themes after per-theme hyperparameter and prompt tuning.
T0 review reviewed 2026-08-05 challenge →
load-bearing objection A transparent, useful pilot of LLM coding for a STEM Ways of Thinking rubric, but the reported kappa values are selected on the same data they summarize, so the 'substantial agreement' claim is optimistic. the 4 major comments →
Investigation of the Inter-Rater Reliability between Large Language Models and Human Raters in Qualitative Analysis
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
Core claim
The central claim is that optimizing prompts and model hyperparameters makes GPT-4o and GPT-4.5-preview reliable enough to reproduce expert human consensus coding for three of four themes in an engineering-design physics lab context. Per theme, the authors chose the better of two models and set temperature and top-p by grid search; they used polished few-shot prompts and decomposed the coding task into one binary classification per theme per text segment. The resulting Cohen's kappa values were 0.60 for Engineering Design, 0.70 for Physics Concepts, above 0.6 for Math Constructs, and 0.55 for Metacognitive Thinking. The paper presents these values as evidence that LLMs can serve as scalable
What carries the argument
The mechanism is a tuned LLM-as-rater pipeline: a polished few-shot prompt containing the theme rubric with prototypical example quotes, decomposed into one binary rating per theme per text segment, with per-theme model choice and hyperparameters (temperature and top-p) optimized through repeated API runs. Cohen's kappa, a chance-corrected agreement statistic between two raters, converts the LLM outputs and human consensus labels into a reliability estimate.
Load-bearing premise
The reported kappa values assume that selecting the best model and settings on the same 204 text segments used for evaluation gives a fair, unbiased estimate of how well the LLM would agree with human raters on new transcripts.
What would settle it
Run the optimized prompts and per-theme settings from Table II on a fresh set of engineering-design discussion transcripts, have the same human raters code them to consensus, and compute Cohen's kappa; if the new kappa for engineering design, physics concepts, or math constructs falls below 0.6, the tuned results are specific to the original 204 segments rather than general.
If this is right
- Human coders could use LLMs to pre-code large corpora, focusing their own effort on adjudicating and refining machine labels rather than reading every segment.
- Domain-specific coding rubrics (physics concepts, math constructs) are likely to transfer best to LLM assistance, while rubrics that rely on broad inference (metacognitive thinking) may need more human involvement.
- Prompt polishing with short, prototypical examples and per-theme hyperparameter search can raise LLM-human agreement by roughly 0.14 in kappa, so tuning is a meaningful step for future qualitative-coding studies.
- Model choice matters: GPT-4o handled physics and math constructs best, while GPT-4.5 performed better on engineering design, so a multi-model pipeline may be appropriate.
- With human oversight, LLM-assisted coding could make qualitative studies of student thinking feasible at scales previously impractical, potentially surfacing new themes in larger datasets.
Where Pith is reading between the lines
- A direct validation step left implicit in the paper is to fix the optimized settings on a training subset and then measure kappa on held-out transcripts; this would test how much of the reported agreement depends on tuning to these 204 segments.
- A natural next test is a hybrid workflow in which the LLM flags low-confidence or borderline segments for human review; the paper's per-theme kappa values suggest the human review load would concentrate on metacognitive-thinking statements.
- The same prompt-polishing and decomposed-coding recipe could in principle be applied to other qualitative coding rubrics, but the paper's own results imply that transfer will be strongest for rubrics with clear, domain-specific criteria.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper investigates whether LLMs (GPT-4o and GPT-4.5-preview) can reliably reproduce human qualitative coding of student audio transcripts in an engineering-design physics course. Human raters coded 204 text segments by consensus into four themes (ED, PC, MC, MT). The authors engineered few-shot prompts and tuned temperature and top-p per theme through the OpenAI API, then computed Cohen's kappa between each LLM and the human consensus. They report that after optimization, three themes reach substantial agreement (kappa > 0.6) and one (MT) moderate agreement (kappa = 0.55), and conclude that LLMs can scale qualitative analysis with human oversight.
Significance. If the reported agreement estimates are valid, this is a useful proof-of-concept for LLM-assisted qualitative coding in physics education research, with practical implications for scaling thematic analysis. The study is one of few to explicitly explore hyperparameter optimization and prompt polishing for IRR with LLMs, and it provides detailed methodological transparency (decomposed coding, 5-run averaging, per-theme optimization, and a table of optimal settings). The authors also appropriately acknowledge in the Limitations section that hyperparameter optimization may overfit and that the sample is small. However, the central quantitative claim currently rests on an in-sample selection procedure, so the magnitude of the reported kappa values is not yet established as a generalizable estimate.
major comments (4)
- [Sec. III, Table II, Fig. 3] The central claim of 'substantial agreement after optimization' is based on per-theme selection of model, temperature, and top-p on the same 204 segments used to compute the final Cohen's kappa. As the authors state in Limitations, this risks overfitting hyperparameters to this dataset. The reported kappa is effectively a maximum over the searched configurations, which is an upward-biased estimate of agreement on new data, especially with per-theme class counts in the tens. To support the abstract's claim, the authors should either use a held-out test set, cross-validation, or nested model selection, and report the resulting kappa values. Without such correction, the three 'substantial' results may not generalize.
- [Sec. II, Table I] The few-shot prompt examples appear to be drawn from the same transcripts used for evaluation. The Methods state that after testing on text segments from three of the 14 transcripts, a few-shot prompt with 'human-labeled example quotes' was adopted, and the evaluation uses '204 text segments excluding the example segments in the prompt.' If any example quotes come from the same transcripts or conversation context, the model may be exposed to near-exact language from the evaluation set, inflating kappa. The authors should clarify the provenance of example quotes and, if they come from the evaluation corpus, quantify how many of the 204 segments overlap or are closely paraphrased. This is load-bearing for the reported reliability.
- [Sec. II, Sec. III] No confidence intervals are reported for Cohen's kappa, and no human-human kappa is reported. With 204 segments and likely imbalanced positive/negative counts per theme, the standard error of kappa is nontrivial; a point estimate of 0.60 or 0.70 may not significantly exceed 0.6. Moreover, since the two human raters coded to consensus, the reader cannot tell whether the LLM approaches human-level agreement. Reporting bootstrapped or analytic confidence intervals, and ideally a pre-consensus human-human kappa on a subset, would substantially strengthen the conclusions.
- [Sec. IV, 'Conclusion & Implications'] The claim that optimization improved kappa by 0.14 on average and that this is 'statistically significant (p < 0.02) using a Mann-Whitney test' is not fully specified. It is unclear what units are compared in the Mann-Whitney test (per-theme mean kappas? 5 runs per theme?), how many observations enter the test, and whether the comparison accounts for the fact that the same segments are used for both default and optimized conditions. This significance statement should be clarified or removed.
minor comments (4)
- [General] A few formatting and citation issues: reference [36] has a large author list that could be compressed; reference [42] is used for the methodological flow figure but may not be the most specific source; and the abstract/body use 'Kappa' and 'κ' inconsistently. Please standardize.
- [Fig. 4] The four panels of Fig. 4 are informative but the axes and annotations are small; consider enlarging or adding a caption that explicitly states the numbers of runs and the error bars (if any).
- [Sec. II, last paragraph] The sentence 'There were 204 text segments excluding the example segments in the prompt' is ambiguous. It should state whether the example segments were part of the original corpus and were removed, or whether 204 is the total after removing them. This matters for the leakage concern.
- [Sec. V, Limitations] The limitation about 'small subset of the data' is useful, but the authors should also mention the absence of a human-human reliability baseline as a limitation, rather than leaving it implicit.
Circularity Check
Reported κ values are the optimized objective on the same 204 segments, so 'substantial agreement' is partly a fitted quantity.
specific steps
-
fitted input called prediction
[Sec. II (Methods), paragraph beginning 'To find agreement...'; Sec. III (Findings), Fig. 3 and Table II]
"We optimized the LLMs for performance. Model hyperparameters like temperature and top-p, [45] were fine-tuned."
The same 204 text segments are used both to select each theme's model, temperature, and top-p (Table II) and to compute the final Cohen's κ (Fig. 3). The selection criterion is Cohen's κ itself, so the reported κ for each theme is the maximum over the searched grid of (model × temperature × top-p) on the exact data used for selection. Thus the headline 'substantial agreement (κ > 0.6) for three themes' is the optimized objective, not an independent out-of-sample estimate; the few-shot prompt examples are also human-labeled quotes from the same coding framework/transcripts, adding further leakage. The paper's own limitation states 'the optimization of models might be overfitting the hyperparameters to our dataset,' confirming that the final κ is partly a fitted quantity rather than a genera
full rationale
The paper's derivation chain is empirical, not mathematical: 204 transcript segments are coded by humans, then LLMs rate the same segments under various prompts and hyperparameters. The reported agreement is Cohen's κ after per-theme selection of model, temperature, and top-p on the full dataset. Because the final κ is the maximum over the searched configurations on the same 204 segments, it is by construction an optimistic in-sample value; the 'substantial agreement' conclusion is not a prediction of performance on new data. The default-vs-optimized comparison and the per-theme differences are still informative, and the paper honestly flags the overfitting risk in its Limitations. However, the central claim that LLMs 'can be a reliable tool' rests on these optimized in-sample κ values, so the quantitative headline reduces, in part, to the selection procedure. This matches the fitted-input-called-prediction pattern. There is no meaningful self-citation circularity or definitional equivalence: the human coding framework is external, and the κ computation is standard. Score 6 reflects partial circularity: the reported agreement is the optimized objective, not an independent measure.
Axiom & Free-Parameter Ledger
free parameters (3)
- temperature =
ED: 1.1, MT: 1.1, MC: 0.9, PC: 0.9
- top-p =
ED: 0.8, MT: 0.8, MC: 0.9, PC: 0.9
- model choice =
ED: GPT-4.5; MT, MC, PC: GPT-4o
axioms (4)
- domain assumption Two human raters coding to consensus provide a valid and error-free gold standard for each segment.
- domain assumption The WoT rubric from [39] applies cleanly to the segmented audio transcripts in this physics course.
- domain assumption 204 text segments from 14 groups in one lab section are sufficient for stable per-theme Cohen's kappa estimates.
- domain assumption Manually cleaned transcripts represent the group discussion despite low audio quality.
Cite this review
Pith. "Pith review of Investigation of the Inter-Rater Reliability between Large Language Models and Human Raters in Qualitative Analysis." pith.science (2026). https://pith.science/paper/HP3OGVSN
@misc{pith2026250814764,
author = {Pith},
title = {Pith review of: Investigation of the Inter-Rater Reliability between Large Language Models and Human Raters in Qualitative Analysis},
year = {2026},
howpublished = {\url{https://pith.science/paper/HP3OGVSN}},
note = {Machine review of arXiv:2508.14764}
}
abstract
Qualitative analysis is typically limited to small datasets because it is time-intensive. Moreover, a second human rater is required to ensure reliable findings. Artificial intelligence tools may replace human raters if we demonstrate high reliability compared to human ratings. We investigated the inter-rater reliability of state-of-the-art Large Language Models (LLMs), ChatGPT-4o and ChatGPT-4.5-preview, in rating audio transcripts coded manually. We explored prompts and hyperparameters to optimize model performance. The participants were 14 undergraduate student groups from a university in the midwestern United States who discussed problem-solving strategies for a project. We prompted an LLM to replicate manual coding, and calculated Cohen's Kappa for inter-rater reliability. After optimizing model hyperparameters and prompts, the results showed substantial agreement (${\kappa}>0.6$) for three themes and moderate agreement on one. Our findings demonstrate the potential of GPT-4o and GPT-4.5 for efficient, scalable qualitative analysis in physics education and identify their limitations in rating domain-general constructs.
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The prompts for the other three themes followed the same structure and were polished likewise. To find agreement between human raters and LLMs, we FIG. 2: Example of a polished few-shot prompt. performed an IRR by calculating Cohen’s κ for each theme. There were 204 text segments excluding the example seg- ments in the prompt. To classify them, we used Op...
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This paper was first reviewed by deepseek-v4-flash on August 5, 2026.
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