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The way how the correction for solar activity is made appears at least as important as the method how the trend is calculated, particularly for foF2.
‡ P value for trend is calculated using the median for each category and modeled as a continuous variable.
In this third step, the trend series is separated into equal boxes of length n, where n = N/ total number of boxes); and in each box the local trend is calculated (a linear representation of the trend function in that box using the least squares method).
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To obtain the strain rate values, the derivative of the smoothed time series trend was calculated.
It is especially misleading since the lack of statistical significance in the trend at the 95percentt confidence level was related to the shortness of the time period over which the trend was calculated.
Cochran-Armitage test for trend was calculated across age groups.
Tests for trend were calculated using continuous data.
To evaluate trend over hormone status, χ for trend was calculated.
Tests for linear trend were calculated by including BMI and height, respectively, as continuous variables.
Statistical significance of trend was calculated by categorizing exposure variables and treating scored variables as continuous.
Chi square for linear trend was calculated to ascertain linearity for the important age groups.
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CEO of Professional Science Editing for Scientists @ prosciediting.com