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关联规则挖掘(Association rule mining)

我有一个主要是整数值的数据集。 我想在其上应用关联规则挖掘。 我已经看过像Apriori等流行的算法,但是它们都处理具有布尔值的数据,即事务中是否存在项目或者不存在。

是否有一种算法可以让我们除了计数之外还考虑属性的值? (我计划将数据规范化为0到1之间的值)


I have a dataset with mostly integer values. I want to apply association rule mining on it. I have taken a look at the popular algorithms like Apriori, etc. but all of them work on data which have boolean values, i.e., either the item exists in the transaction or doesn't.

Is there an algorithm which lets us account for values of the attributes in addition to their counts? (I plan to normalize the data to have values between 0 and 1)


原文:https://stackoverflow.com/questions/28759325
更新时间:2022-03-29 11:03

最满意答案

DATE值中提取年份,然后使用字符串连接来创建新日期。

DECLARE @year CHAR(4) = DATEPART(YEAR, @date)
SELECT @year + '-01-01' AS [start year], @year + '-12-31' AS [end year]

如果他们全都为零,则不需要包含时间。

如果您希望将它们作为实际datedatetime类型,请使用CASTCONVERT

SELECT CONVERT(DATE, @year + '-01-01') AS [start year],
       CONVERT(DATE, @year + '-12-31') AS [end year]

Extract the year from your DATE value, then use string concatenation to make new dates.

DECLARE @year CHAR(4) = DATEPART(YEAR, @date)
SELECT @year + '-01-01' AS [start year], @year + '-12-31' AS [end year]

You don't need to include the time if they're all zeroes.

If you want them as real date or datetime types, use CAST or CONVERT

SELECT CONVERT(DATE, @year + '-01-01') AS [start year],
       CONVERT(DATE, @year + '-12-31') AS [end year]

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