This is Dataplot data file NATR533.DAT Tire Tread Wear (2 Methods) (Linear Regression Example) Source--Natella, Mary G. (1963). Experimental Statistics. National Bureau of Standards Handbook 91. U.S. Government Printing Office. Page 5-33 to 5-40. Number of observations = 16 Number of variables per line image = 2 Order of variables on a line image-- 1. Response variable = tread wear via groove method 2. Factor 1 = tread wear via weight method Note--Tread wear is measured in hundreds of miles To read this file into Dataplot-- SKIP 25 READ NATR533.DAT Y X Y X Groove Method Weight Method Tread Wear Tread Wear ------------------------------ 357 459 392 419 311 375 281 334 240 310 287 305 259 309 233 319 231 304 237 273 209 204 161 245 199 209 152 189 115 137 112 114