ANSCOMBE'S GRAPHICS VERSUS STATISTICS DATA (WITH THANKS TO KEITH EBERHARDT AT NIST) NUMBER OF OBSERVATIONS = 11 NUMBER OF VARIABLES = 8 ORDER OF VARIABLES ON A LINE IMAGE-- X1 Y1 X2 Y2 X3 Y3 X4 Y4 NOTE--THESE 4 DATA SETS ARE DIFFERENT IN GRAPHICAL STRUCTURE BUT HAVE THE FOLLOWING IDENTICAL STATISTICS-- SAMPLE SIZE = 11 MEAN OF X'S = 9.0 MEAN OF Y'S = 7.5 INTERCEPT = 3.0 SLOPE = 0.5 RESID. STAND. DEV. = 1.125 CORR. COEFFICIENT = 81.7% SOURCE--ANSCOMBE, FRANK J. (1973). "GRAPHS IN STATISTICAL ANALYSIS" AMERICAN STATISTICIAN, VOL. 27, FEBRUARY 1973. TO READ THIS FILE INTO DATAPLOT (& ANALYZE)-- SKIP 25 READ ANSCOMBE.DAT X1 Y2 X2 Y2 X3 Y3 X4 Y4 CHARACTERS X; LINES BLANK MULTIPLOT 2 2 PLOT Y1 X1; PLOT Y2 X2; PLOT Y3 X3; PLOT Y4 X4 X1 Y1 X2 Y2 X3 Y3 X4 Y4 ------------------------------------------------------------------- 10.00 9.14 10.00 9.14 10.00 7.46 8.00 6.58 8.00 8.14 8.00 8.14 8.00 6.77 8.00 5.76 13.00 8.74 13.00 8.74 13.00 12.74 8.00 7.71 9.00 8.77 9.00 8.77 9.00 7.11 8.00 8.84 11.00 9.26 11.00 9.26 11.00 7.81 8.00 8.47 14.00 8.10 14.00 8.10 14.00 8.84 8.00 7.04 6.00 6.13 6.00 6.13 6.00 6.08 8.00 5.25 4.00 3.10 4.00 3.10 4.00 5.39 19.00 12.50 12.00 9.13 12.00 9.13 12.00 8.15 8.00 5.56 7.00 7.26 7.00 7.26 7.00 6.42 8.00 7.91 5.00 4.74 5.00 4.74 5.00 5.73 8.00 6.89