In this paper, we describe and contrast these approaches, and discuss several issues associated with futility analyses, such as ethical considerations, whether or not type I error can or should be reclaimed, one-sided vs two-sided futility rules, and the impact of futility analyses on power.
You can open an AutoCAD DWG or DXF file for review, and then add your comments. For example, you might want to review and annotate a CAD drawing and then return it to the person who created it. On the File menu, click Open. Under Files of type, click AutoCAD Drawing.
How to Open a PSD File. The best programs for opening and editing PSD files are Adobe Photoshop and Adobe Photoshop Elements, as well as CorelDRAW and Corel's PaintShop Pro tool. Other Adobe programs can use PSD files too, like Adobe Illustrator, Adobe Premiere Pro, and Adobe After Effects. These programs, however, are mainly used for video or audio editing and not as graphics editors like Photoshop. If you're looking for a free program to open PSD files, I recommend GIMP.