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Linear Predictive Equation
Does anyone know how to develop a linear predictive equation for one set of
variables based on using a different independent variabe? |
#2
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Linear Predictive Equation
Linda -
For a single explanatory variable, use (1) an XY (Scatter) chart and Add Trendline or (2) the INTERCEPT and SLOPE worksheet functions. For one or more explanatory variables, use (3) the Regression tool of the Analysis ToolPak or (4) the array-entered LINEST worksheet function. - Mike www.mikemiddleton.com "Linda" wrote in message ... Does anyone know how to develop a linear predictive equation for one set of variables based on using a different independent variabe? |
#3
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Linear Predictive Equation
Thanks! You really helped a lot. Now I need to know how to develop a
confidence interval based on that equation based on a certain independent variable. "Mike Middleton" wrote: Linda - For a single explanatory variable, use (1) an XY (Scatter) chart and Add Trendline or (2) the INTERCEPT and SLOPE worksheet functions. For one or more explanatory variables, use (3) the Regression tool of the Analysis ToolPak or (4) the array-entered LINEST worksheet function. - Mike www.mikemiddleton.com "Linda" wrote in message ... Does anyone know how to develop a linear predictive equation for one set of variables based on using a different independent variabe? |
#4
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Linear Predictive Equation
If you have an earlier version than Excel 2003, you may prefer the formulas at
http://groups.google.com/group/micro...a03470e7a1c650 Similarly, the numerically best way to calculate yhat, the predicted value at x is yhat = AVERAGE(ydata) +(x-AVERAGE(xdata))*SLOPE(ydata,xdata) instead of FORECAST, or using the intercept estimate. Regardless, the confidence bound at x (not necessarily an observed value) for the regression line is yhat +/- TINV(1-conf,df) *STEYX(ydata,xdata) *SQRT(1/n+(x-AVERAGE(xdata))^2/DEVSQ(xdata)) Jerry "Linda" wrote: Thanks! You really helped a lot. Now I need to know how to develop a confidence interval based on that equation based on a certain independent variable. "Mike Middleton" wrote: Linda - For a single explanatory variable, use (1) an XY (Scatter) chart and Add Trendline or (2) the INTERCEPT and SLOPE worksheet functions. For one or more explanatory variables, use (3) the Regression tool of the Analysis ToolPak or (4) the array-entered LINEST worksheet function. - Mike www.mikemiddleton.com "Linda" wrote in message ... Does anyone know how to develop a linear predictive equation for one set of variables based on using a different independent variabe? |
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