In scatter diagrams done by PLOT operation,confidence bands for simple linear regressionare obtained by following specifications: (These options suggested by Simo Puntanen) The confidence intervals for the average is plotted by CONF_BAND1=<list of confidence levels>. Prediction intervals for a single observation is plotted by CONF_BAND2=<list of confidence levels>. The Working-Hotelling confidence band is plotted by CONF_BAND3=<list of confidence levels>. References: Section 6.1.3 in Seber, George A.F. and Lee, Alan J. (2003). Linear Regression Analysis. Second Edition. Wiley, New York. Section 1.7 in Weisberg, Sanford (1985). Applied Linear Regression. Second Edition. Wiley, New York. P = Plotting of scatter diagrams

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