This is a study on neighbors’ interaction observed in aggregation of spilling outs in common passages. First of all, we assume that neighbors’ interaction will make some aggregation in a series of spilling-outs. Based on this assumption, we check aggregation as a sign for neighbor’s interaction. First, we draw histograms for frequency of spilling-outs by common passage and find some deviation compared with a histogram at random situation.
Second, we propose a new index, neighborhood correlation, to check aggregation in a certain area. This index is a modification of Moran’s I which can allow us to check correlation not only in one event, but also between two different events. We use adjacency-matrix to calculate this index which defines a boundary of neighborhood and check the range where we can recognize aggregation. With this index, we validate four types of aggregation; aggregation in spilling-outs area, aggregation in each category of spilling-outs, aggregation between spilling-outs area and each category, and aggregation over each category.
As for the spilling-outs area, we find the highest aggregation in the center part of the passages where residents pass every day and it might be bothering if something is placed in that area. This result suggests us that residents are likely to follow what others do when they think it may bother someone. As for the category of spilling-outs, “bicycle& vehicle” has no aggregation in itself nor with other categories or spilling-outs area, and this means that residents put “bicycle& vehicle” in common passages without thinking about other. On the other hand, “decoration” “barrier” and “cupboard” have clear aggregation in themselves but don’t have with other categories or spilling-outs area, while “green& gardening” “laundry” and “food& pot” has aggregation both in themselves and with other categories. This result implies that there are two types of spilling-outs’ aggregation, one of which is the type some residents imitate what others do, and other is that residents put what they want to put in common passages when they find neighbors do the same thing. In addition, “green& gardening” “laundry” and “food& pot” have aggregation among themselves. Regarding that these three are all have relationships with residents’ daily life and most people put them in their own balconies or gardens, the aggregation among these spilling-outs suggest that the situation they use a common passage as if it were their private area is transmitted and settled down to neighbors.
Therefore, we find some aggregation in a series of spilling-outs and also that some categories and pairs of categories of spilling-outs have stronger aggregation than others. This shows us the prospect for neighbors’ interaction and its character in common passages. It is true that this is the result from only one example, but this is a good example of the common passages with cooperative scenery created by their residents, and shows us a possibility of an indirect communication mediated by spilling-outs.
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