Psychometric Validation and KR-20 Reliability of a Knowledge Tool for Semi- Intensive Pig Production
DOI:
https://doi.org/10.48165/IJEE.2025.613RT03Keywords:
Dichotomous response, Internal reliability, Knowledge tool, KR-20, Scientific pig production, Semi-intensive, ValidityAbstract
An instrument was constructed to assess the knowledge level of pig farmers with respect of scientific pig production under a semi-intensive rearing system. Primary review of relevant literature was the initial step in the identification of relevant items. A list of 42 items was prepared and then refined for preliminary assessment on sixty purposively selected pig farmers hailing from non-sampling areas. Data was collected during 2024- 25, through direct questioning method using an interview schedule by registering dichotomous responses, “correct” and “incorrect”, scored in binary format as “1” and “0”, respectively for each item. The raw data was analysed to determine item difficulty (P) and item discrimination (D), which sorted thirty relevant items. Validity of selected items was confirmed through a point-biserial correlation test, with all items having an rpb >0.30. The overall internal reliability of the knowledge tool was established by KR 20 test, which yielded a coefficient value of 0.92, signifying very high reliability of the tool in measuring knowledge of pig farmers. The 30 items, encompassing five well structured items under six major thematic dimensions, were incorporated to comprehensively assess the knowledge level of respondents. Based on equal class intervals, majority of respondents had medium level of knowledge.
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