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For tests of baselines of about 51 km, the comparison between short- and longbaseline solutions revealed that mean differences of a few millimetres and 2 cm are obtained for the horizontal coordinates and vertical component, respectively, and the standard deviation of differences on the scale of a few centimetres.
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Hypothesis tests of baseline characteristics, however, are superfluous and could be harmful if they lead investigators to suppress reporting any baseline imbalances.
Tests of baseline differences are not necessarily wrong, just illogical.
We carried out tests of baseline differences using conditional logistic regression.
48 177 Unfortunately significance tests of baseline differences are still common 23 32 210; they were reported in half of 50 RCTs trials published in leading general journals in 1997.
This includes estimates of frequency distributions and chi-square tests of baseline characteristics and regression analyses using the 'svy' commands in Stata software, StataCorp, College Station, TX.
We investigated the behavioral phenotypes of the HS mice using a test battery (Lad et al. 2009) which includes tests of baseline activity, and measures relating to anxiety, depression and cognition.
Statistical tests of baseline characteristics showed that patients with missing data tended to score higher on GSRS-IBS (m = 48.1, SD = 12.5 vs. m = 40.9, SD = 11.2; t60 = 1.90, p =.06) than patients that completed the post-treatment assessment.
Testing of baseline sera for assessment of the impact of pre-existing Ad5 neutralizing titers was done at Crucell Holland BV (Netherlands), and pre- and post-vaccination Ad5 neutralizing titers were done at the NVITAL Laboratory (Gaithersburg, MD).
*Denominator is 92 studies with statistical testing of baseline differences.
To quantitatively assess construct validity, independent sample t-tests of baseline mean ESSI scores were compared among depressed versus non-depressed patients.
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