Forecast, Logest or Linest?

Q706003

New Member
Joined
Aug 6, 2010
Messages
1
Hi Guys

I am trying to set up a spreadsheet using either Forecast, Logest or Linest to estimate future kit receipt numbers using past data of units sent and units returned and i am having problems, first of all is this possible using the data below with any of these functions in Excel? And secondly, any tips to help me along?

Month .........................Kits Shipped ..................Kits Returned
JAN.............................78000............................31252
FEB ............................100124 ..........................32657
MAR ...........................103012 ...........................41135
APR ............................90560 .............................37122
MAY ...........................92104..............................37498
JUN ............................89281 ..............................40357
JUL..............................86234...............................?????
 
Last edited:

Excel Facts

Can you AutoAverage in Excel?
There is a drop-down next to the AutoSum symbol. Open the drop-down to choose AVERAGE, COUNT, MAX, or MIN

brettdj

Active Member
Joined
Feb 5, 2003
Messages
426
You would be best off graphing the relationship as a X Y scatter plot (shipped v returned), and inserting trendlines to measure the strength of any relationship. Also do youe expect the season to impact shipping, or the returned/shipping ratio

You could chart

- linear
- log
- ln
- quadtratic etc

If you were to use a function use LINEST, as you can use it to fit polynomials, log relationships, ln relationships etc. It can also return the regression fitting stats

But charts are easier for the human eye to understand

Cheers

Dave
 

tusharm

MrExcel MVP
Joined
May 28, 2002
Messages
11,029
The type of trendline you use depends on an understanding of the underlying issues and cannot be dictated from "outside." In your case you probably also have to account for seasonality.

For more information on trendlines see
Regression Analysis
http://www.tushar-mehta.com/publish_train/data_analysis/16.htm

Hi Guys

I am trying to set up a spreadsheet using either Forecast, Logest or Linest to estimate future kit receipt numbers using past data of units sent and units returned and i am having problems, first of all is this possible using the data below with any of these functions in Excel? And secondly, any tips to help me along?

Month .........................Kits Shipped ..................Kits Returned
JAN.............................78000............................31252
FEB ............................100124 ..........................32657
MAR ...........................103012 ...........................41135
APR ............................90560 .............................37122
MAY ...........................92104..............................37498
JUN ............................89281 ..............................40357
JUL..............................86234...............................?????
 

Forum statistics

Threads
1,176,150
Messages
5,901,632
Members
434,909
Latest member
subratgupta

We've detected that you are using an adblocker.

We have a great community of people providing Excel help here, but the hosting costs are enormous. You can help keep this site running by allowing ads on MrExcel.com.
Allow Ads at MrExcel

Which adblocker are you using?

Disable AdBlock

Follow these easy steps to disable AdBlock

1)Click on the icon in the browser’s toolbar.
2)Click on the icon in the browser’s toolbar.
2)Click on the "Pause on this site" option.
Go back

Disable AdBlock Plus

Follow these easy steps to disable AdBlock Plus

1)Click on the icon in the browser’s toolbar.
2)Click on the toggle to disable it for "mrexcel.com".
Go back

Disable uBlock Origin

Follow these easy steps to disable uBlock Origin

1)Click on the icon in the browser’s toolbar.
2)Click on the "Power" button.
3)Click on the "Refresh" button.
Go back

Disable uBlock

Follow these easy steps to disable uBlock

1)Click on the icon in the browser’s toolbar.
2)Click on the "Power" button.
3)Click on the "Refresh" button.
Go back
Top