[Retracted] Recommending Crowdfunding Project: A Graph Kernel-Based Link Prediction Method for Extremely Sparse Implicit Feedback

Table 2

The descriptive statistics of the datasets with different sparsity.

No.	Dataset	No. of investments per user	Sparsity (%)	No. of investors	No. of projects	No. of investments
1	Less sparse dataset	9 and more	94.36	639	220	7922
2	Medium sparse dataset	5∼8	96.81	2986	229	21847
3	Extremely sparse dataset	3∼4	97.95	8598	230	40542