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st: RE: significance of mean and median

From   "Martin Weiss" <>
To   <>
Subject   st: RE: significance of mean and median
Date   Mon, 24 Nov 2008 13:38:49 +0100

Line for the server...

On the first part: Just do -mean var1- and see whether the CI overlaps 0.
Note that the default in Stata is for 95% CIs. Change that as appropriate
for your analysis...


-----Original Message-----
[] On Behalf Of Bastian Steingros
Sent: Monday, November 24, 2008 12:56 PM
Subject: st: significance of mean and median

Hello everybody,

I have this problem:

After creating the descriptive statistics of my sample I want to show that
the mean of a certain variable is statistically significant.
For example the mean of var1 is 0,45. Now I want to show that the positive
sign is significant.
Is ttest the appropriate way to do so?

Moreover, in another sample I want to predict the GDP using two different
regression models.
Finally, I want to compare the predicted values with the real GDP, that is,
I will compare the mean and the median of the inaccuracy. 
Inaccuracy is defined as (GDP_predicted - GDP)/GDP

Is there a way to show that the median (mean) inaccuracies of the two models
are statistically different from each other?

may be *signtest*???


bastian s
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