我已经下载了 Python 包 statsmodels（使用 pip）并运行了测试，发现有几个测试失败了。测试命令是
>>> import statsmodels.api as sm
>>> sm.test()
有两个错误和一个失败：
=====================================================================
ERROR: statsmodels.sandbox.panel.test_sandwich.test_cov_cluster_2groups
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Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/nose/case.py", line 197, in runTest
self.test(*self.arg)
File "/usr/local/lib/python2.7/site-packages/statsmodels/sandbox/panel/test_sandwich.py", line 30, in test_cov_cluster_2groups
cov01, covg, covt = sw.cov_cluster_2groups(res, group, group2=time)
File "/usr/local/lib/python2.7/site-packages/statsmodels/sandbox/panel/sandwich_covariance.py", line 555, in cov_cluster_2groups
group_intersection = Group(group)
File "/usr/local/lib/python2.7/site-packages/statsmodels/tools/grouputils.py", line 182, in __init__
uni, uni_idx, uni_inv = combine_indices(group)
File "/usr/local/lib/python2.7/site-packages/statsmodels/tools/grouputils.py", line 60, in combine_indices
return_inverse=True)
File "/usr/local/lib/python2.7/site-packages/numpy/lib/arraysetops.py", line 178, in unique
perm = ar.argsort(kind='mergesort')
TypeError: requested sort not available for type
======================================================================
ERROR: statsmodels.tsa.base.tests.test_datetools.test_infer_freq
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Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/nose/case.py", line 197, in runTest
self.test(*self.arg)
File "/usr/local/lib/python2.7/site-packages/statsmodels/tsa/base/tests/test_datetools.py", line 63, in test_infer_freq
npt.assert_string_equal(_infer_freq(b), 'B')
File "/usr/local/lib/python2.7/site-packages/statsmodels/tsa/base/datetools.py", line 234, in _infer_freq
elif delta >= timedelta(28*nobs) and delta <= timedelta(31*nobs):
TypeError: ufunc 'greater_equal' not supported for the input types, and the inputs could not be safely coerced to any supported types according to the casting rule 'safe'
======================================================================
FAIL: test_monotone_fn_inverter (statsmodels.distributions.tests.test_ecdf.TestDistributions)
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Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/statsmodels/distributions/tests/test_ecdf.py", line 41, in test_monotone_fn_inverter
npt.assert_array_equal(f.y, x[::1])
File "/usr/local/lib/python2.7/site-packages/numpy/testing/utils.py", line 707, in assert_array_equal
verbose=verbose, header='Arrays are not equal')
File "/usr/local/lib/python2.7/site-packages/numpy/testing/utils.py", line 636, in assert_array_compare
raise AssertionError(msg)
AssertionError:
Arrays are not equal
(mismatch 100.0%)
x: array([ 15., 14., 13., 12., 11., 10., 9., 8., 7., 6.])
y: array([ 6, 7, 8, 9, 10, 11, 12, 13, 14, 15])
----------------------------------------------------------------------
Ran 1454 tests in 67.411s
其他可能有用的信息：
statsmodel v0.4.0（也试过v0.5.0）numpy v1.6.2scipy v0.10.1- 所有这些包都被pip'd
python v2.7.3brew install python使用自制软件（即不是 OSX 本机 python）安装在 Mac OSX 10.8 上。- 我还安装了一些其他包：
joblib v0.6.4、nose v1.1.2和patsy v0.1.0.Nose需要进行测试，并且patsy需要import statsmodels.api. 测试套件还抱怨joblib需要并行运行。
我不确定前两个错误是怎么回事，而且失败看起来有点奇怪，有点像实现更改或其他什么......但我怀疑 statsmodels 家伙/gals 在他们调用它之前运行了他们的测试一天:) 那么这里发生了什么？