How to display the sales forecasts and Simulated_Forecast?
Hello
I have this table how can I get the values of 2014_Forecast and Simulated_2014 by using the Least_Square_Regresion or REGR_SLOPE function for a period of 3 months.
TRANSACTION_TYPE | MONTH | YEAR_2012 | YEAR_2013 | 2014_Forecast | Simulated_2014 |
Sales | 01 | -18.74 | -38.00 | ||
Sales | 02 | -19.60 | -34.09 | ||
Sales | 03 | -20.20 | -33.10 | ||
Sales | 04 | -19.96 | -32.21 | ||
Sales | 05 | -23.13 | -29.63 | ||
Sales | 06 | -23.88 | -28.46 | ||
Sales | 07 | -30.11 | -43.89 | ||
Sales | 08 | -33.69 | -35.97 | ||
Sales | 09 | -32.65 | -29.57 | ||
Sales | 10 | -37.22 | -28.18 | ||
Sales | 11 | -37.15 | -31.63 | ||
Sales | 12 | -41.70 | -32.76 |
Thanks in advance for your help
Regards¨
Carlos
Why you don't store the DATE as DATE data type data types?
Before you can use REGR_ *, you will need to set your data model.
Quick fix:
alter table sales_unpivoted add ( a_date as (trunc( to_date( "YEAR" || "MONTH", 'YYYYMM'), 'MONTH' )));
From there:
- use a static reference point and the MONTHS_BETWEEN() function to convert the DATE NUMBER (which is REGR_ * what)
- Use ADD_MONTHS() to convert a DATE
This example uses all values in SALES_UNPIVOTED to solve y = m * x + b
with prediction_results as ( -- find the solution to the curve y = m*x + b select transaction_type ,regr_slope( amount, months_between( a_date, to_date('201201','YYYYMM')) ) as M ,regr_intercept( amount, months_between( a_date, to_date('201201','YYYYMM')) ) B from sales_unpivoted group by transaction_type ), x_generator as ( -- we need a "data set" representing the "x" values select level - 1 as x from dual connect by level < 12 * 4 ), prediction_generator as ( -- calculate our "predicted values" select P.transaction_type ,add_months(to_date('201201','YYYYMM'),X.x) as a_date ,P.M * X.x + P.b as predicted_amount -- y = m*x + b from prediction_results P, x_generator X ) -- join everything together select U.transaction_type, G.a_date, U.amount, G.predicted_amount ,months_between( G.a_date, to_date('201201','YYYYMM')) as x_axis from sales_unpivoted U right outer join prediction_generator G on (U.a_date = G.a_date and U.transaction_type=G.transaction_type) order by G.a_date;
Three month avg, etc. is just a classic analysis with windowing clause.
MK
Tags: Database
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