davemcwish
New Member
- Joined
- Nov 12, 2013
- Messages
- 11
I have the following data that I've plotted and trying to forecast when 'Value' reaches 8
<colgroup><col><col></colgroup><tbody>
</tbody>Using a linear forecast trendline, I get the equation
y=0.0019x-71.545
which gives a value of x as 41865, for y=8
This doesn't seem right as the first value I have is for 01 Feb 2015 (42036)
Interestingly, if I switch to a Logarithmic trendline I get
y=78.558ln(x)-829.44
which gives a reasonable value of 42622 (9 Sep 2015)
Anyone got an answer to why the linear trendline equation gives a seemingly incorrect value ?
<tbody> </tbody> |
<colgroup><col><col></colgroup><tbody>
</tbody>
y=0.0019x-71.545
which gives a value of x as 41865, for y=8
This doesn't seem right as the first value I have is for 01 Feb 2015 (42036)
Interestingly, if I switch to a Logarithmic trendline I get
y=78.558ln(x)-829.44
which gives a reasonable value of 42622 (9 Sep 2015)
Anyone got an answer to why the linear trendline equation gives a seemingly incorrect value ?