8000 Std. deviation of slope is calculated incorrectly for clearsky.detect_clearsky · Issue #1241 · pvlib/pvlib-python · GitHub
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Std. deviation of slope is calculated incorrectly for clearsky.detect_clearsky #1241
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Std. deviation of slope is calculated incorrectly for clearsky.detect_clearsky#1241
#1242
@cwhanse

Description

@cwhanse
cwhanse
opened on Jun 4, 2021

Describe the bug

This line

raw = np.diff(data)

does not calculate the slope since it is not divided by the time interval.

Expected behavior

raw = np.diff(data) / sample_interval

Versions:

  • pvlib.__version__: 0.8.1

Additional context

All current tests use 1-minute intervals, so the tests are not incorrect.

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