A Coding Example of Computing Link Relative Ratio and Year-on-year Basis

Link relative ratio refers to comparison between the current data and data of the previous period. The interval is usually one month. For example, divide sales amount of April by that of March, and you get the link relative ratio of April. Hour, day, week and quarter can also be used as the time interval. Year-on-year comparison is the comparison between the current data and data of the corresponding period of the previous year. For example, divide sales amount of April 2014 by that of April 2013. In business, data of multiple periods is usually computed to find the variation trend. 

Seeking link relative ratio and year-on-year comparison is common inter-row and inter-group computations, which are easy to be performed with esProc. The following example is used to illustrate the computations. 

Case description:

To compute the link relative ratio and year-on-year comparison of each months sales amount within the designated period. The data comes from table order. Some of the data is shown below:

esProc code:

A1=esProc.query("select * from sales3 where OrderDate>=? and OrderDate<=?",begin,end)

A2=A1.groups(year(OrderDate):y,month(OrderDate):m;sum(Amount):mAmount)

A3=A2.derive(mAmount/mAmount[-1]:lrr)

A4=A3.sort(m)

A5=A4.derive(if(m==m[-1],mAmount/mAmount[-1],null):yoy)

Code interpretation:

A1: Query in the database according to periods. begin and end are external parameters. Such as, begin="2011-01-01 00:00:00"end="2014-07-08 00:00:00"(i.e. the date of today which can be obtained through now() function). Some of the query results are as follows: 

A2: Group orders by year and month, then summarize and seek each months sales amount. Some of the computed results are as follows: 

A3: Add a new field Irr, i.e, the link relative ratio on a month-on-month basis. The code is mAmount/mAmount[-1], in which mAmount represents sales amount of the current month, and mAmount[-1] represents that of the previous month. Note that the initial months link relative ratio is empty (i.e. January 2011). Computed results are: 

A4: Sort A3 by month and year to compute year-on-year comparison. Complete code should be: =A3.sort(m,y). Since A3 is originally sorted by the year, so we just need to sort by the month, the code is: A3.sort(m), which has a higher performance. Some of the computed results are:  

A5: Add a new field yoy, i.e., theyear-on-year comparison of monthly sales amount. The code is: if(m==m[-1],mAmount/mAmount[-1],null), meaning that the computation of year-on-year comparison is only performed over the corresponding months. Note that the year-on-year comparison for months of the initial year (i.e. the year 2011) is always. Some of the computed results are:  

A row of code, A6=A5.sort(y:-1,m), can be added to make observation easier. That is, sort A5 in descending year order and ascending month order. Note that the data comes to an end in July 2014. Results are shown below: 

Views: 587

Comment by Jim King on July 30, 2014 at 8:39pm

Compare the sales amount with the previous month, compare with the corresponding period of last year...in business analytics, such data comparison is quite necessary to find the business trends,how do you calculate them? And what do you think of the method illustrated above?

Comment

You need to be a member of Oracle Community to add comments!

Join Oracle Community

Oracle Community On

I'm not a fan of advertising, and so I will not be including any advertisements on OracleCommunity.net. However, managing this community does not come without cost! If you are willing to donate to help pay for the monthly community fees and domain services I accept Bitcoin and PayPal donations.

Donate Bitcoins

Badge

Loading…

Blog Posts

College Paper Writing Service

Actually time is a limited resource, especially for college and academic students. Who have to deal with Time is a limited resource, especially for college students who have to compact with their extracurricular, studies, and assignment paper.

Although most of the students are very dedicated for their college life and college studies. But time is a valuable thing for every person especially for students. So if you have ever faced the pressure of working on multiple assignment…

Continue

Posted by david smith on December 4, 2016 at 10:23pm

Steps to Follow When Developing Interactive Children’s eBooks

Today, just getting a book published and made available in print isn’t enough. As printed books will only reach half of your audience base. Publishers can now increase their sales by developing books in a format that is preferred by your readers. Publishers are already recognizing the disruption brought about by eBooks.…

Continue

Posted by Alvaro Dee on December 3, 2016 at 12:25am

Recover a deleted folder

Specifically to solve caused by- starting up you see, our own laptop or computer publisher, Right after that using [HKEY_CLASSES_ROOT\ftp] Add a vital dubbed recovering files from sd card "ShellFolder" When it comes to cord cost point "E436EBB6-524F-11CE-9F53-0020AF0BA770, The mistake do just stop developing, With out a reactivate or other behavior applicable.…

Continue

Posted by Rachel C on December 1, 2016 at 10:09pm

4 Things to Know About the GREATEST Function in Oracle

The GREATEST function in Oracle is one that is helpful, but I haven't seen used very often. If you do use it, keep these things in mind.
What Is The GREATEST Function?
The first thing to know about the function is what it does.
GREATEST finds the greatest value in a list of provided values.
The syntax is:
GREATEST ( expr1, [ expr_n] )
You provide it with a set of expressions, and the function will find the greatest of…
Continue

Posted by Ben Brumm on November 27, 2016 at 10:00am

© 2016   Created by Steve Karam.   Powered by

Badges  |  Report an Issue  |  Terms of Service