If the relationship displayed in your scatterplot is not monotonic, you will have to consider either a transformation or another type of test entirely. In practice, checking for assumption #2 it is not a difficult task and Stata provides all the tools you need to do this. It is also worth...
A scatterplot is one way to check for outliers—look for points that are far away from the others. The relationship is linear:“Linear” means that the relationship between the two variables can be described reasonably well by a straight line. You can use a scatterplot to check whether the...
For multiple values of parameters, the results are automatically displayed in a table, as we see above. For more examples of tables, see [PSS] power, table. If you wish to produce a power plot, see [PSS] power, graph. 10 power twocorrelations — Power analysis for a two-sample ...
4 screeplot — Scree plot of eigenvalues Remarks and examples stata.com Cattell (1966) introduced scree plots, which are visual tools used to help determine the number of important components or factors in multivariate settings, such as principal component analysis and factor analysis; see [MV] ...
Then, meta-analysis was performed by using Review Manager 5.3 and STATA 14 software. A random-effect model was employed to evaluate all related pooled results. Statistical heterogeneity of each study was assessed by I2. Publication bias was determined by funnel plot and the Begg'...
Figure 1. Box plot of mean annual Benzene (B) concentration in patients with diffuse skin disease and limited skin disease (p = 0.02). This finding was confirmed by a low but significant positive correlation between B exposure and skin score (R = 0.3; p≤ 0.05), as shown in Figure 2...
To test to see whether your two variables form a linear relationship you simply need to plot them on a graph (a scatterplot, for example) and visually inspect the graph's shape. In the diagram below, you will find a few different examples of a linear relationship and some non-linear ...
This column explores the principles and practice of such plot-making, considering both wide and long (panel or longitudinal) data structures in which such data may appear. Applications include analysis of change over time or space and indeed any kind of correlation or comparison between variables....
The data have nooutliers: Outliers are observations that don’t follow the same patterns as the rest of the data. A scatterplot is one way to check for outliers—look for points that are far away from the others. The relationship is linear: “Linear” means that the relationship between ...
(a) Box plot: proportions of patients with a deletion involving the whole RB1 gene (both breakpoints out of RB1) or part of RB1 (one breakpoint in RB1). (b) One-factor analysis. We found no correlation between the parental origin of the deletion and deletion size, Rb phenotype (...