scaleInspection and a number of useful helper functions
scaleInspection is a function to generate a PDF with information to diagnose and inspect scales (aggregate measures); makeScales actually generates the scales; and meanConfInt and sdConfInt provide confidence intervals for means and standard deviations.
scaleInspection(dat, items = NULL, docTitle = "Scale inspection", docAuthor = "Author", pdfLaTexPath, rnwPath=getwd(), filename = "scaleInspection", convertFactors=TRUE, scaleReliability.ci=FALSE, conf.level=.95, digits=2, rMatrixColsLandscape = 6, pboxWidthMultiplier = 1, scatterPlotBaseSize = 4, pageMargins=15, show=FALSE, pval=TRUE) makeScales(dat, scales) meanConfInt(vector=NULL, mean=NULL, sd=NULL, n=NULL, se=NULL, conf.level=.95) sdConfInt(vector=NULL, sd=NULL, n=NULL, conf.level=.95)
- Dataframe containing the items of the relevant scale
- Either a character vector with the itemnames, or, if the items are organised in scales, a list of character vectors with the items in each scale.
- A list of character vectors with the items in each scale, where each vectors' name is the name of the scale.
- Title to use when generating the PDF.
- Author(s) to include when generating the PDF.
The path to PdfLaTex. This file is part of a LaTeX installation that creates a pdf out of a .tex file.
In Windows, you can download (portable) MikTex from http://miktex.org/portable. You then decide yourself where to install MikTex; pdflatex will end up in a subfolder 'miktex\bin', so if you installed MikTex in, for example, 'C:\Program Files\MikTex', the total path becomes 'C:\Program Files\MikTex\miktex\bin'. Note that R uses slashes instead of backslashes to separate folders, so in this example, pdfLaTexPath should be 'C:/Program Files/MikTex/miktex/bin'
In MacOS, you can install MacTex from http://tug.org/mactex/ By default, pdflatex ends up in folder '/user/texbin', which is what pdfLaTexPath should be in that default case.
In Ubuntu, you can install TexLive base by using your package manager to install texlive-latex-base, or using the terminal: 'sudo apt-get install texlive-latex-base' In ubuntu, by default pdflatex ends un in folder '/usr/bin', which is what pdfLaTexPath should be in that default case.
- The path where the temporary files and the resulting PDF should be stored.
- The filename to use to save the pdf.
- Whether to convert factors to numeric vectors for the analysis.
- TRUE or FALSE: whether to compute confidence intervals for Cronbach's Alpha and Omega (uses bootstrapping function in MBESS, takes a while).
- Confidence of confidence intervals (for reliability estimates (if requested with scaleReliability.ci), meand, and sd, for respectively scaleInspection, meanConfInt and sdConfInt).
- The number of digits to use in the tables.
- At how many columns (or rather, variables) or more should rMatrices be printed landscape?
- Used for print.rMatrix; used to tweak the width of columns in the correlation matrix.
- Size of one scatterplot in the scattermatrix in centimeters. If the total scattermatrix becomes larger than 18 cm, it's scaled down to 18 cm.
- Margins of the page in millimeters.
- Whether to show the results (or only write them to the PDF).
- Whether to print p-values as p-values in correlation matrix.
- Numeric vector to use when computing confidence intervals.
- Mean to use when computing confidence intervals (when no vector is provided).
- Standard deviaton to use when computing confidence intervals (when no vector is provided).
- Number of datapoints to base confidence intervals on.
- Standard errorto use when computing confidence intervals (when no standard deviation or vector is provided).
scaleInspection generates a PDF with useful diagnostics to assess a scale; those from scaleDiagnosis and an rMatrix.
makeScales generates the scales and stores them in the dataframe.
meanConfInt and sdConfInt just compute and return a confidence interval for a mean or standard deviation.
- scaleInspection returns nothing; it just generates a PDF.makeScales returns the provided dataframe, now including the new scale variables.meanConfInt and sdConfInt return an object, with in its 'output' list, the confidence interval for a mean or standard deviation.
## Not run: # scaleInspection(mtcars, items=c('disp', 'hp', 'drat'), pdfLaTexPath="valid/path/here"); # ## End(Not run) newDataframe <- makeScales(mtcars, list(senselessScale = c('disp', 'hp', 'drat'))); sdConfInt(sd=4, n=30); meanConfInt(mean=5, sd=4, n=30)