Then execute medcalcsetup.msi and follow the instructions for the installation procedure. If you have previously installed MedCalc, you must close any open (running) copy of MedCalc first.The MedCalc installation files are suitable for new installations only as well as software updates.MedCalc 22 can read all previous file formats but when saved, the new file format is used. Important: files saved in MedCalc version 22 cannot be read by previous MedCalc versions. (Version 22.Version 22 introduces a new file format. Kirkwood BR, Sterne JAC (2003) Essential medical statistics, 2 nd ed.Altman DG (1991) Practical statistics for medical research.Note that in MedCalc P-values are always two-sided (or two-tailed). When the P-value is less than 0.05 (P<0.05), the conclusion is that the two means are significantly different. The P-value is the area of the t distribution with n 1 + n 2 − 2 degrees of freedom, that falls outside ± t (see Values of the t distribution table). The significance level, or P-value, is calculated using the t-test, with the value t calculated as: The standard error se of the difference between the two means is calculated as: Where s 1 and s 2 are the standard deviations of the two samples with sample sizes n 1 and n 2. The program first calculates the pooled standard deviation s:
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |