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All Blog Posts Tagged 'grouping' (2)

Calculation cases of Link Relative Ratio and Year-on-year Comparison in data analytics

Cross-row and group computation often involves computing link relative ratio and year-on-year comparison. Link relative ratio refers to comparison between the current data and data of the previous period. Generally, it takes month as the time interval. For example, compare the sales amount of April with that of March, and the growth rate we get is the link relative ratio of April. Hour, day, week and quarter can also be used as the time…

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Added by Jessica May on September 22, 2014 at 2:00am — No Comments

A Method of Grouping and Summarizing Data of Big Text Files in R Language

It is common to use R language to group and summarize data of files. Sometimes we may find ourselves processing comparatively big files which have smaller computed result and bigger source data. We cannot load them wholly to the memory when we need to compute them. The only solutions could be batch importing and computing as well as result merging. We’ll use an example in the following to illustrate the way of R language to group and summarize data from big text files.

Here is a file,…

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Added by Jessica May on August 24, 2014 at 8:54pm — 2 Comments

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