OPEN DATA REUSE IV
• Update frequency • Dissemination. • Reputation.
2.2 METHODOLOGY FOR STUDYING PUBLISHED DATASETS From the 163 valid portals selected, a sample of datasets statistically representative of the population with a 10-point interval has been chosen with 95 % confidence using the Surveysoftware tool ( http://www. surveysoftware.net/sscalce.htm ). This has resulted in a sample number of 300. In the previous section, all the datasets that were specific to each portal were identified, which allowed a list to be made of the 71,849 datasets collected, establishing the numbering intervals that corresponded to each portal. Following this step, 300 different numbers were randomly generated by means of a random number generator, so that each number could be assigned to a portal according to the previous ranges. A total of 71,849 datasets were identified in the 163 selected portals. Considering the size of the study population, 300 datasets were sampled. In line with Abella, Ortiz-de-Urbina- Criado, De-Pablos-Heredero (2017), each of the data reusability dimensions described in the MELODA metric (Abella, Ortiz-de-Urbina-Criado and De-Pablos-Heredero, 2014) and updated to the latest version of MELODA 5 (Abella, Ortiz-de- Urbina-Criado and De-Pablos-Heredero, 2019) were considered for each dataset: • Legal reuse licence • Technical standard in which the information is presented • Information access mechanisms • Data model used • Geographical content of the information
2.3 METHODOLOGY FOR
STUDYING THE REUSE OF PUBLISHED DATA
A survey of open data portals was conducted during the months of October to December 2022 and January to March 2023. The survey was sent to 113 portals whose manager or contact form had been requested and a contact mechanism was found. There were 31 complete responses to the questionnaire, a response rate of 27.43 %. Each of them had to answer a questionnaire on the reuse of data on their data portal, their knowledge of reusers and their policies to promote reuse (Annex 1). The new version of the MELODA metric assesses the reputation of the data on these portals, but as there are no rankings on this aspect, to implement this dimension in a robust way, questions on the reputation of the published data were included in this survey directed at the managers of open data portals. For reputation, the survey included the assessment of the 163 open data portals, including a specific question for them to assess the level of knowledge and reputation of a random sample of between 10 and 11 portals, always excluding their own portal. In this way, 16 groups were created for each portal manager to vote for other portals. Once the first responses had been received, it was observed that there were some portals that were not rated (69 of the total), so a second round of surveys was carried out and, finally, a last round for the remaining portals, sending a new questionnaire
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