![]() If this option is selected, you are asked to give the categorical field to be used in creating groups, (optionally) whether they would like regression and loess curves plotted for each group, and the location of the legend that identifies the different groups. Groups are plotted with different colors and plotting characters. Plot by groups: This option allows for an examination of the effect of a categorical field on the relationship between the X and Y fields, with each value of the categorical resulting in a group of X and Y values. ![]() Doing this is often useful for exploring certain types of non-linear relationships. Log Y axis: If selected, a natural log transformation is applied to the Y values. Log X axis: If selected, a natural log transformation is applied to the X values. It only influences the appearance points on the graphs, not the fitted regression and loess lines. Any or all of x, y, s, and c may be masked arrays, in which case all masks will be combined and only unmasked points will be plotted. This is useful if a larger number of records in the Y field take on one or a small number of values. The plot function will be faster for scatterplots where markers dont vary in size or color. Jitter Y: When selected, the Y values are randomly perturbed by a small amount. This is useful if a larger number of records in the X field take on one or a small number of values. Jitter X: When selected, the X values are randomly perturbed by a small amount. This is useful in assessing the distribution of values for both fields, and they are included by default. Marginal boxplots: Includes univariate boxplots of the X and Y field along each respective access. Show spread: Two curves showing the results of loess models to both the root-mean-square positive and negative residuals from the original loess line to display conditional spread and asymmetry in the errors. The smaller the number, the smaller the area used. Span for smooth: A parameter that controls the size of the local area used to construct the loess estimates. Smooth line: Displays a non-linear line between the X and Y fields that is created using a loess (non-parametric local regression) model. ![]() Least-squares (regression) line: Displays a simple linear regression line between the X and Y fields.
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