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.
Adobe Acrobat and Acrobat reader files. The ENV file extension is primarily associated with Adobe Acrobat and Acrobat Reader files. An ENV file holds spelling and format setting information. Acrobat lets you capture a document and then view or share it in its original format and appearance. To view an Acrobat document, which is called a Portable Document Format (PDF) file, you need Acrobat Reader.