Anybody working on the SII case?

15 views
Skip to first unread message

Carla Nunes

unread,
Feb 27, 2011, 1:48:58 PM2/27/11
to econ_401_w...@googlegroups.com
I will try to give it a shot today, and was wondering if there will be others to check answers with.  :)

Carla

Spencer

unread,
Feb 27, 2011, 6:07:45 PM2/27/11
to econ_401_w...@googlegroups.com, econ_401_w...@googlegroups.com
I attempted the first part

Sent from my iPhone

Adi Aloni

unread,
Feb 27, 2011, 8:06:42 PM2/27/11
to econ_401_w...@googlegroups.com

I think I’ll try to work on it tomorrow, but I already have a question – do you think it’s best to use all the observations for the analysis or leave some out to test the model later?

Spencer

unread,
Feb 27, 2011, 8:27:38 PM2/27/11
to econ_401_w...@googlegroups.com, <econ_401_winter_2011@googlegroups.com>
Wouldnt you have to do the p value test to see which combination works best? So some variables won't be included?

Sent from my iPhone

Spencer

unread,
Feb 27, 2011, 8:28:02 PM2/27/11
to econ_401_w...@googlegroups.com, <econ_401_winter_2011@googlegroups.com>
Oh oops nevermind. Misread it!

Sent from my iPhone

On Feb 27, 2011, at 5:06 PM, "Adi Aloni" <alon...@gmail.com> wrote:

Carla Nunes

unread,
Feb 27, 2011, 9:03:33 PM2/27/11
to econ_401_w...@googlegroups.com
Adi,

I'm doing w/ all the records.  I don't know how many to take out.. and he didn't say anything.

If anyone has any other better explanation, please provide.  :)

Carla

Savita Raina

unread,
Feb 27, 2011, 9:42:01 PM2/27/11
to econ_401_w...@googlegroups.com, Carla Nunes
When is the Scientfic instruments HW due? Monday 28th or Wednesday 2nd

David Song

unread,
Feb 27, 2011, 10:02:52 PM2/27/11
to econ_401_w...@googlegroups.com
What is the opportunity cost of doing this bonus problem? I choose to
spend the time and energy studying for my other classes and practice
on my linear regression ;-)

Spencer

unread,
Feb 27, 2011, 10:14:29 PM2/27/11
to econ_401_w...@googlegroups.com, econ_401_w...@googlegroups.com, Carla Nunes
Due tomorrow

Sent from my iPhone

Adi Aloni

unread,
Feb 28, 2011, 1:29:38 AM2/28/11
to econ_401_w...@googlegroups.com

This is the best regression I was able to produce, using all the records:

 

Coefficients

Standard Error

t Stat

P-value

Intercept

1746377.721

577727.0556

3.022842195

0.004662733

Speed

0.276548597

0.09644229

2.867503422

0.006962448

Capacity

33.77967549

7.193464097

4.695884352

4.00609E-05

Year

-882.9725778

292.4286711

-3.019445988

0.00470426

Afterintro

735.5619645

230.1680317

3.195760763

0.002952113

Monitor

4805.058225

2086.173365

2.30328807

0.027321888

XL

9946.542016

2824.500805

3.521522104

0.001214143

 

R square is 0.717. I hope the formatting is not too screwed up…

Carla Nunes

unread,
Feb 28, 2011, 2:00:51 AM2/28/11
to econ_401_w...@googlegroups.com
I got the same, after 10 million regressions run.  :)

jonathan car

unread,
Feb 28, 2011, 5:25:56 PM2/28/11
to econ_401_w...@googlegroups.com
Carla,
How did you come up with the 6 variables that you used? Meaning: Afterintro, Capacity, Monitor, Speed, XL, and Year
Jonathan
From: Carla Nunes <ccrn...@gmail.com>
To: econ_401_w...@googlegroups.com
Sent: Sun, February 27, 2011 11:00:51 PM

Adi Aloni

unread,
Feb 28, 2011, 5:39:46 PM2/28/11
to econ_401_w...@googlegroups.com

I just kept adding/deleting variables until I got to the best combination of R^2 and t stats for the variables.

jonathan car

unread,
Feb 28, 2011, 5:58:42 PM2/28/11
to econ_401_w...@googlegroups.com
Thanks Adi (and Carla)
So it was you and Carla who got the "best" answer. I tried bunch of regressions but could not come up with your variables. I even tried Lin-Log function, which was worst.
Thanks a lot for sharing. See you in class.
 
Regards
Jonathan
From: Adi Aloni <alon...@gmail.com>
To: econ_401_w...@googlegroups.com
Sent: Mon, February 28, 2011 2:39:46 PM
Subject: RE: Anybody working on the SII case?
Reply all
Reply to author
Forward
0 new messages