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st: significance of mean and median

From   "Bastian Steingros" <>
Subject   st: significance of mean and median
Date   Mon, 24 Nov 2008 12:55:48 +0100

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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