topic Standard Deviation of Warehouse Movements in QlikView

Standard Deviation of Warehouse Movements

Wed, 19 Jul 2017 08:51:54 GMT

Hi Qlikers,

i write to ask you a solution to calculate the Standard Deviation of Warehouse Movements on script.

It could be interesting to have the standard deviation of the warehouse movements to find the safety stock about an item.

I attach a simple example to be clear about my goal.

SCRIPT

WAREHOUSE_MOVEMENTS:

Load * Inline

[ ITEM, MOVEMENT_DATE, MOVEMENT_TYPE, MOVEMENT_QTY

A, '07/05/2016', LOAD, 10

A, '27/05/2016', LOAD, 2

A, '17/05/2016', UNLOAD, -13

A, '12/05/2016', LOAD, 17

A, '10/06/2016', UNLOAD, -2

A, '05/06/2016', UNLOAD, -20

A, '13/06/2016', LOAD, 30

A, '27/06/2016', UNLOAD, -12

A, '15/07/2016', LOAD, 50

A, '02/07/2016', UNLOAD, -50

A, '13/07/2016', LOAD, 6

A, '25/07/2016', UNLOAD, -11

A, '05/08/2016', UNLOAD, -32

A, '12/10/2016', LOAD, 27

A, '07/01/2017', UNLOAD, -5

A, '17/03/2017', UNLOAD, -25

A, '22/04/2017', UNLOAD, -2

A, '30/05/2017', LOAD, 40

];

Thanks in advance!!

Re: Standard Deviation of Warehouse Movements

effinty2112 — Wed, 19 Jul 2017 09:18:36 GMT

Hi Michele,

Try:

StdEv:

LOAD

ITEM,

MOVEMENT_TYPE,

Stdev(MOVEMENT_QTY) as StDev

Resident WAREHOUSE_MOVEMENTS Group by ITEM, MOVEMENT_TYPE;

Result:

ITEM	MOVEMENT_TYPE	StDev
A	LOAD	16.976875
A	UNLOAD	15.120259

Remove MOVEMENT_TYPE from the above srcipt id you don't want to differentiate between movement types.

Cheers

Andrew

Re: Standard Deviation of Warehouse Movements

Wed, 19 Jul 2017 11:58:26 GMT

Thanks Andrew!!

I made two types of deviation standard.

WAREHOUSE_MOVEMENTS1:

Load * Inline

[ITEM, MOVEMENT_DATE, MOVEMENT_TYPE, MOVEMENT_QTY

A,'07/05/2016',LOAD,10

A,'27/05/2016',LOAD,2

A,'17/05/2016',UNLOAD,-13

A,'12/05/2016',LOAD,17

A,'10/06/2016',UNLOAD,-2

A,'05/06/2016',UNLOAD,-20

A,'13/06/2016',LOAD,30

A,'27/06/2016',UNLOAD,-12

A,'15/07/2016',LOAD,50

A,'02/07/2016',UNLOAD,-50

A,'13/07/2016',LOAD,6

A,'25/07/2016',UNLOAD,-11

A,'05/08/2016',UNLOAD,-32

A,'12/10/2016',LOAD,27

A,'07/01/2017',UNLOAD,-5

A,'17/03/2017',UNLOAD,-25

A,'22/04/2017',UNLOAD,-2

A,'30/05/2017',LOAD,40

];

WAREHOUSE_MOVEMENTS:

LOAD

ITEM,

MOVEMENT_DATE,

MOVEMENT_TYPE,

MOVEMENT_QTY,

ITEM&'|'&MOVEMENT_TYPE AS KEY_IT_MOVTY

RESIDENT WAREHOUSE_MOVEMENTS1;

DROP TABLE WAREHOUSE_MOVEMENTS1;

LEFT JOIN(WAREHOUSE_MOVEMENTS)

LOAD

ITEM&'|'&MOVEMENT_TYPE AS KEY_IT_MOVTY,

Stdev(MOVEMENT_QTY) as STDEV_MOVTY

Resident WAREHOUSE_MOVEMENTS Group by ITEM, MOVEMENT_TYPE;

LEFT JOIN(WAREHOUSE_MOVEMENTS)

LOAD

ITEM,

Stdev(MOVEMENT_QTY) as STDEV

Resident WAREHOUSE_MOVEMENTS Group by ITEM;

The result is this.

Re: Standard Deviation of Warehouse Movements

effinty2112 — Wed, 19 Jul 2017 12:03:54 GMT

Hi Michele,

Glad to help and thanks for showing your chart, that's a nice visualisation.

cheers

Andrew

Re: Standard Deviation of Warehouse Movements

effinty2112 — Wed, 19 Jul 2017 12:13:59 GMT

Hi Michelle,

You might like to look into adding Reference Lines to a chart to show your standard deviation. Go to the Presentation tab and add two reference lines for ±stdev(MOVEMENT_QTY).

Re: Standard Deviation of Warehouse Movements

ruanhaese — Wed, 19 Jul 2017 12:25:58 GMT

You can also use the StDev function in your expressions and get the same result.

In this case adding a table with Dimension Movement_Type and an expression

=StDev( MOVEMENT_QTY )

would yield the same result, and would allow for the selections,

whereas in the script its not as versatile on the selections.

https://help.qlik.com/en-US/sense/3.2/Subsystems/Hub/Content/ChartFunctions/StatisticalAggregationFunctionsinCharts/stde…

Re: Standard Deviation of Warehouse Movements

Wed, 19 Jul 2017 12:52:35 GMT

I agree with you Ruan!!

I think that your solution is perfect for a User that want to do many selections but mine must only take a look on this report.

He selects only the item and looks the analysis on it.

I want to make an easy report that has only a few field (maybe one) changeable.

Re: Standard Deviation of Warehouse Movements

Wed, 19 Jul 2017 12:56:17 GMT

yes of course,

i made an expression firstly only to check the accuracy of the result.

Now I do a Reference line!!!

Re: Standard Deviation of Warehouse Movements

Thu, 20 Jul 2017 11:59:30 GMT

Hi Andrew,

I need a suggestion for another problem linked with the previous one.

I have to calculate standard deviation considering a MonthName aggregation.

Unfortunately not each month has consumptions but i need to consider all months to calculate a correct standard deviation.

Example:

The StDev function of Qlik consider only the months with a value (3 in this example) to calculate the standard deviation.

How can i do on script?

Thanks in advance.

Re: Standard Deviation of Warehouse Movements

effinty2112 — Thu, 20 Jul 2017 12:58:06 GMT

Hi Michele,

I would tackle it something like this:

Temp:

Load

Month,

Sum( ... ) //monthly consumption

From ...

Group by Month;

MappingConsumption:

Mapping Load * Resident Temp;

Drop Table Temp;

If you have a table of calendar months (Months) then:

Left Join(Months)

Load

Month,

ApplyMap('MappingConsumption',Month,0) as Consumption

Resident Months;

The mapping table will not have any rows for months with no consumption but we are rescued by the ApplyMap's default parameter, in this case 0 so these months will receive a zero value rather than remain null.

Good Luck

Andrew

Re: Standard Deviation of Warehouse Movements

Thu, 20 Jul 2017 15:18:26 GMT

Good idea but i need keeping linked the fields ITEM, ITEM DESCRIPTION with MONTHS and CONSUMPTION.

The previous piece of script is the following:

Warehouse_Movements:

LOAD

[Item Code],

[Item Description],

[Movement Date],

monthname([Movement Date]) AS [Movement Month],

CM,

[Movement Description],

[Movement Qty],

Stock

FROM

(biff, embedded labels, table is Sheet1$)

where [Movement Qty]<0;

I have to keep ITEM CODE and ITEM DESCRIPTION linked with MONTHS and MONTHLY CONSUMPTION.

It is a problem because your solution use a mapping table that allow only two column.

How can i solve this problem?

I can't do many mapping table because MONTHS aren't a key field (ITEM is it).