Use this to predict the value for a future observation based on the current fitted linear regression model.
Displays the name of the explanatory variate for which the values of the response variable are to be predicted from.
Predict values at
Specify values of the explanatory variable to predict values of the response variable from. You can either type a single value, a series of values separated by columns or spaces, or the word mean to predict the mean value.
Displays the name of the grouping factor for which the values of the response variable are to be predicted from.
Predict levels at
Specify the grouping levels at which the predictions for the response variable are to be calculated. You can either type one or more of the levels in directly, or select a method from the dropdown list.
Allows you standardize the table of predictions. The Marginal option standardizes the table of predictions by weighting by the number of observations within each level of the factor(s). Equal standardizes by having equal weight for each of the levels of the factor(s). The Specify option lets you explicitly specify the weightings to be used in the predictions by entering the weights in the space provided.
Enter the weights when the Specify option is selected for the standardization method.
Include variance of future observation
Specifies whether you want the variance of predictions to be calculated on the basis of forecasting new observations. The default is for the variance of predictions to be calculated on the basis of summarizing the data to which the data has been fitted.
Specifies which items of output are to be produced.
|Description||Describes the standardization policies used when forming predictions|
|Standard errors||Standard errors of predictions|
|Standard error of differences||Standard error of differences between predictions|
|LSDs||Least significant differences between predictions (for ordinary linear regression models or GLMs with Normal distribution only). The LSD significance level (%) can be specified in the space provided.|
|Confidence limits for predictions||Confidence limits for each prediction. The confidence level (%) can be specified in the space provided.|
|Predictions||Table or scalar||Predicted values|
|Standard errors||Table or scalar||Standard errors for the predicted values|
|Confidence limits||Table or scalar||Confidence limits for each predicted value. The confidence level is that set in the Display section.|
Display in spreadsheet
Display the saved results in a new spreadsheet window.
Plot table of predictions
If this is selected, the predictions will be plotted. The Options button opens the Plot table of predictions dialog which controls how the predictions are plotted. You need to complete either the Grouping factor or Explanatory variate before using the Options button.
Plot least significant intervals
If this is selected, the least significant intervals for the means will be plotted. Least significant intervals (LSIs) are used for comparing a set of predicted means graphically, especially when their SEDs differ. LSIs are intervals (or error bars) that are designed to overlap where there is no significant difference between estimates, and to be disjoint (i.e. not to overlap) where there are significant differences. The Options button opens the Least Significant Intervals Plot Options dialog which controls how the least significant intervals are plotted. There must be more than one estimated mean for a graph to be produced.