[Tutor] i installed the package statsmodels but i get an error when i use it

[eva maria gualandi]

Good afternoon,
I installed from *https://pypi.python.org/pypi/statsmodels
<https://pypi.python.org/pypi/statsmodels> *the package statsmodels for
python 2.7 (32bit) , i have to do some test statistics for a time series
analysis that i can find under statsmodels.tsa. In particular i really need
to do a Dickey Fuller test and in agreement with the statsmodels
documentation ( from
*http://statsmodels.sourceforge.net/devel/generated/statsmodels.tsa.stattools.adfuller.html
<http://statsmodels.sourceforge.net/devel/generated/statsmodels.tsa.stattools.adfuller.html>*)
i run this simple programm

import numpy as np
import statsmodels
from statsmodels.tsa import stattools
x = np.array([1,2,3,4,3,4,2,3])
result = statsmodels.tsa.statools.adfuller(x,1)
print result

but unfortunately i get the following error message:

Traceback (most recent call last):
  File "C:\Python27\esempio_adftest.py", line 3, in <module>
    from statsmodels.tsa import stattools
  File "C:\Python27\lib\site-packages\statsmodels\tsa\stattools.py", line
7, in <module>
    from statsmodels.regression.linear_model import OLS, yule_walker
  File "C:\Python27\lib\site-packages\statsmodels\regression\__init__.py",
line 1, in <module>
    from linear_model import yule_walker
  File
"C:\Python27\lib\site-packages\statsmodels\regression\linear_model.py",
line 37, in <module>
    from statsmodels.tools.tools import (add_constant, rank,
  File "C:\Python27\lib\site-packages\statsmodels\tools\__init__.py", line
1, in <module>
    from tools import add_constant, categorical
  File "C:\Python27\lib\site-packages\statsmodels\tools\tools.py", line 14,
in <module>
    from pandas import DataFrame
  File "C:\Python27\lib\site-packages\pandas\__init__.py", line 15, in
<module>
    raise ImportError('C extensions not built: if you installed already '
ImportError: C extensions not built: if you installed already verify that
you are not importing from the source directory

the thing that i really don't understand is that in the shell window if i
type import statsmodels.tsa i don't get any error, also if i type the help
funcion i can see that in the package there is the function stattools that
i need

>>> import statsmodels.tsa
>>> help(statsmodels.tsa)
Help on package statsmodels.tsa in statsmodels:

NAME
    statsmodels.tsa

FILE
    c:\python27\lib\site-packages\statsmodels\tsa\__init__.py

PACKAGE CONTENTS
    adfvalues
    api
    ar_model
    arima_model
    arima_process
    arma_mle
    base (package)
    descriptivestats
    filters (package)
    interp (package)
    kalmanf (package)
    mlemodel
    setup
    stattools
    tests (package)
    tsatools
    varma_process
    vector_ar (package)
I will really appreciate your help
thanks in advance,

Eva
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