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Tagged Image File Format, abbreviated TIFF or TIF, is a computer file format for storing raster graphics images, popular among graphic artists, the publishing industry, and photographers.
Large discriminations - tall and narrow IIFs; high precision/narrow range Low discrimination - short and wide IIFs; low precision/broad range. IRT â Test Information Function Test Information Function (TIF) â The IIFs are also additive so that we can judge the test as a whole and see at which part of the trait range it is working the best.