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Peer assessment using soft computing techniques


In this paper, we applied a peer assessment scenario at the Technical University of Manabí (Ecuador). Students and professors evaluated some works through rubrics, assigned a numerical score, and provided textual feedback grounding why such a numerical score was determined, to detect inaccuracy between both assessments. The proposed model uses soft computing techniques to reduce the professor's workload in the correction process. Experiments were carried out with a data set in the Spanish language. We applied a supervised machine learning approach to obtain a sentiment score corresponding to specific textual feedback, and the fuzzy logic approach to detect inaccuracy between numerical and sentiment scores and obtain the assessment score. The results showed that the support vector machine model had a better performance with low computational costs when the feedback was represented as a 1-g and 2-g vector, whose relevance was weighted with term frequency-inverse document frequency; moreover, the grader's critical judgment validity was inferred from the similarities between numerical and sentiment scores. At the end, the outcomes assert the model is reliable and guarantees a fair peer assessment procedure.

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Correspondence to Maricela Pinargote-Ortega.

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Appendix A. Rubric

Rubrics were designed, considering the following parameters:

  • Activity objective.

  • Determination of criteria and features.

  • Definition level of resolution. A liker scale was used; the first three levels reflect that the criterion has been fully or mostly adequately met, and the last two levels that little or nothing has been met:

(5) highly adequate, (4) fairly adequate, (3) adequate, (2) not very adequate, and (1) not at all adequate.

  • Numerical score (level of resolution) and feedback textual by each criterion

Table 11 Example of holistic type rubric of activity-2 (exercises of use case diagram)

Table 11 shows a holistic type rubric description containing four criteria.

Appendix B. Examples of labeled Spanish language feedbacks

Table 12 Examples of labeled Spanish language feedbacks from activity-2 (exercises of use case diagram)

Table 12 shows examples of labeled Spanish language feedbacks with the rules of step-4 (data labeling) of section three. Feedback (F1) was labeled (− 1, negative) because it contained the word “not very adequate (poco adecuada).” Feedback (F2) was labeled (1, positive) because it contained “are specified (están especificados).” Feedbacks (F3 and F4) was labeled (− 1, negative) because they contained the word "not (no)."

Appendix C. Data set for model training

Table 13 Some examples of the data set (D1) in Spanish language for model training

Table 13 shows examples of the data set (D1) in the Spanish language for model training using machine and deep learning. The data sets contain activity code, grader code, evaluated code, criterion, numerical score, feedback, and sentiment polarity labeled by the annotator.

Appendix D. Stop-Words in Spanish language

The Stop-Words in the Spanish language were created in a text file, separated by commas, without space between the words; some examples are detailed below:












Appendix E. Parameters of algorithms

Table 14 Machine learning algorithms parameter settings

Table 14 shows the settings of machine learning algorithms parameters, the best settings are highlighted in color light blue.

Table 15 Deep learning algorithms parameter settings

Table 15 shows the settings of deep learning algorithms parameters.

Table 16 Bi-LSTM architecture

Table 16 shows the architecture applied in the Bi-LSTM algorithm.

Appendix F. Performance results of algorithms

Table 17 and Table 18 show the performance results of the machine learning algorithms using the parameter settings of model-1 and model-2 (see Table 14).

Table 17 Performance of machine learning algorithms with model-1 parameters settings
Table 18 Performance of machine learning algorithms with model-2 parameters settings

Appendix G. Data set for detecting inaccuracies and obtaining the assessment score

Table 19 Some examples of the data set (D1) in Spanish language with numerical and sentiment score generated by the predictive model from the textual feedback for the detection of inaccuracies and compute of the assessment score

Table 19 shown examples of the data set (D1) in the Spanish language to detecting inaccuracies and compute the assessment score through fuzzy logic.

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Pinargote-Ortega, M., Bowen-Mendoza, L., Meza, J. et al. Peer assessment using soft computing techniques. J Comput High Educ 33, 684–726 (2021).

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  • Peer assessment
  • Supervised machine learning
  • Natural language processing
  • Sentiment analysis
  • Fuzzy logic
  • Higher education