Desc

0th

Percentile

Describe Data

Produce summaries of various types of variables. Calculate descriptive statistics for x and use Word as reporting tool for the numeric results and for descriptive plots. The appropriate statistics are chosen depending on the class of x. The general intention is to simplify the description process for lazy typers and return a quick, but rich summary.

A 2-dimensional table will be described with it's relative frequencies, a short summary containing the total cases, the dimensions of the table, chi-square tests and some association measures as phi-coefficient, contingency coefficient and Cramer's V. Tables with higher dimensions will simply be printed as flat table, with marginal sums for the first and for the last dimension.

Keywords
multivariate, print, univar
Usage
Desc(x, ..., main = NULL, plotit = NULL, wrd = NULL)
"Desc"(x, main = NULL, maxrows = NULL, ord = NULL, conf.level = 0.95, verbose = 2, rfrq = "111", margins = c(1,2), dprobs = NULL, mprobs = NULL, plotit = NULL, sep = NULL, digits = NULL, ...)
"Desc"(x, main = NULL, plotit = NULL, enum = TRUE, sep = NULL, ...)
"Desc"(x, main = NULL, plotit = NULL, enum = TRUE, sep = NULL, ...)
"Desc"(x, main = NULL, maxrows = NULL, plotit = NULL, sep = NULL, digits = NULL, ...)
"Desc"(x, main = NULL, maxrows = NULL, plotit = NULL, sep = NULL, digits = NULL, ...)
"Desc"(x, main = NULL, maxrows = NULL, ord = NULL, plotit = NULL, sep = NULL, digits = NULL, ...)
"Desc"(x, main = NULL, maxrows = NULL, ord = NULL, plotit = NULL, sep = NULL, digits = NULL, ...)
"Desc"(x, main = NULL, maxrows = NULL, ord = NULL, plotit = NULL, sep = NULL, digits = NULL, ...)
"Desc"(x, main = NULL, ord = NULL, conf.level = 0.95, plotit = NULL, sep = NULL, digits = NULL, ...)
"Desc"(x, main = NULL, dprobs = NULL, mprobs = NULL, plotit = NULL, sep = NULL, digits = NULL, ...)
"Desc"(x, main = NULL, conf.level = 0.95, verbose = 2, rfrq = "111", margins = c(1,2), plotit = NULL, sep = NULL, digits = NULL, ...)
"Desc"(formula, data = parent.frame(), subset, main = NULL, plotit = NULL, digits = NULL, ...)
"print"(x, digits = NULL, plotit = NULL, nolabel = FALSE, sep = NULL, ...)
"plot"(x, main = NULL, ...)
Arguments
x
the object to be described. This can be a data.frame, a list, a table or a vector of the classes: numeric, integer, factor, ordered factor, logical.
main
a character vector, containing the main title(s).If this is left to NULL, the title will be composed as: variablename (class(es)), resp. number - variablename (class(es)) if the enum option is set to TRUE. Use NA if no caption should be printed at all.
wrd
the pointer to a running MS Word instance, as created by GetNewWrd() (for a new one) or by GetCurrWrd() for an existing one. All output will then be redirected there. Default is NULL, which will report all results to the console.
digits
integer. With how many digits shoud the relative frequencies be formatted? Default can be set by DescToolsOptions(digits=x).
maxrows
numeric value, defining the maximum number of rows of a frequency table to be reported. For factors with many levels it is often not interesting to see all of them. Default is hence set to 12 most frequent ones (resp. the first ones if ord is set to levels or names). If for numeric object the value is left to its default NULL, the list of extreme values will be displayed, when x has more than 12 single values and the frequency table else. If maxrows is < 1 it will be interpreted as percentage. Then just as many rows, as the maxrows% most frequent factors will be shown. Say, if maxrows is set to 0.8, then the number of rows is fixed so, that the highest cumulative relative frequency is the first one going beyond 0.8.

If the highest and the lowest values (numeric objects only) should always be reported, maxrows should be set to0.

ord
character out of "name" (alphabetical order), "level", "asc" (by frequencies ascending), "desc" (by freqencies descending) defining the order for a frequency table as used for factors, numerics with few unique values and logicals. Factors (and character vectors) are by default orderd by their descending frequencies, ordered factors by their natural order.
rfrq
a string with 3 characters, each of them being 1 or 0, defining which percentages should be reported. The first position is interpreted as total percentages, the second as row percentages and the third as column percentages. "011" hence produces a table output with row and column percentages. If set to NULL rfrq is defined in dependency of verbose (verbose = "low" sets rfrq to "000" and else to "111", latter meaning all percentages will be reported.) Applies only to tables and is ignored else.

margins
a vector, consisting out of 1 and/or 2. Defines the margin sums to be included. Row margins are reported if margins is set to 1. Set it to 2 for column margins and c(1,2) for both. Default is NULL (none). Applies only to tables and is ignored else.
verbose
integer out of c(2, 1, 3) defining the verbosity of the reported results. 2 (default) means medium, 1 less and 3 extensive results. Applies only to tables and is ignored else.
conf.level
confidence level of the interval. If set to NA no confidence interval will be calculated. Default is 0.95.
dprobs, mprobs
a vector with the probabilities for the Chi-Square test for days, resp. months, when describing a Date variable. If this is left to NULL (default) then a uniform distribution will be used for days and a monthdays distribution in a non leap year (p = c(31/365, 28/365, 31/365, ...)) for the months. Applies only to Dates and is ignored else.
enum
logical, determining if in data.frames and lists a sequential number should be included in the main title. Default is TRUE. The reason for this option is, that if a Word report with enumerated headings is created, the numbers may be redundant or inconsistent.
plotit
boolean. Should a plot be created? The plot type will be chosen according to the classes of variables (roughly following a numeric-numeric, numeric-categorical, categorical-categorical logic). Default can be defined by option plotit, if it does not exist then it's set to FALSE.
sep
character. The separator for the title. By default a line of "-" for the current width of the screen (options("width")) will be used.
nolabel
logical, defining if labels (defined as attribute with the name label, as done by Label) should be plotted.
formula
a formula of the form lhs ~ rhs where lhs gives the data values and rhs the corresponding groups.
data
an optional matrix or data frame containing the variables in the formula formula. By default the variables are taken from environment(formula).
subset
an optional vector specifying a subset of observations to be used.
...
further arguments to be passed to or from other methods. For the internal default method these can include:

Details

Desc is a generic function. It dispatches to one of the methods above depending on the class of its first argument. Typing ?Desc + TAB at the prompt should present a choice of links: the help pages for each of these Desc methods (at least if you're using RStudio, which anyway is recommended). You don't need to use the full name of the method although you may if you wish; i.e., Desc(x) is idiomatic R but you can bypass method dispatch by going direct if you wish: Desc.numeric(x).

This function produces a rich description of a factor, containing length, number of NAs, number of levels and detailed frequencies of all levels. The order of the frequency table can be chosen between descending/ascending frequency, labels or levels. For ordered factors the order default is "level". Character vectors are treated as unordered factors Desc.char converts x to a factor an processes x as factor. Desc.ordered does nothing more than changing the standard order for the frequencies to it's intrinsic order, which means order "level" instead of "desc" in the factor case.

Description interface for dates. We do here what seems reasonable for describing dates. We start with a short summary about length, number of NAs and extreme values, before we describe the frequencies of the weekdays and months, rounded up by a chi-square test.

A 2-dimensional table will be described with it's relative frequencies, a short summary containing the total cases, the dimensions of the table, chi-square tests and some association measures as phi-coefficient, contingency coefficient and Cramer's V. Tables with higher dimensions will simply be printed as flat table, with marginal sums for the first and for the last dimension.

Note that NAs cannot be handled by this interface, as tables in general come in "as.is", say basically as a matrix without any further information about potentially previously cleared NAs.

Description of a dichotomous variable. This can either be a boolean vector, a factor with two levels or a numeric variable with only two unique values. The confidence levels for the relative frequencies are calculated by BinomCI, method "Wilson" on a confidence level defined by conf.level. Dichotomous variables can easily be condensed in one graphical representation. Desc for a set of flags (=dichotomous variables) calculates the frequencies, a binomial confidence intervall and produces a kind of dotplot with error bars. Motivation for this function is, that dichotomous variable in general do not contain intense information. Therefore it makes sense to condense the description of sets of dichotomous variables.

The formula interface accepts the formula operators +, :, *, I(), 1 and evaluates any function. The left hand side and right hand side of the formula are evaluated the same way. The variable pairs are processed in dependency of their classes.

Word This function is not thought of being directly run by the enduser. It will normally be called automatically, when a pointer to a Word instance is passed to the function Desc. However DescWrd takes some more specific arguments concerning the Word output (like font or fontsize), which can make it necessary to call the function directly.

Value

A list containing the following components:

See Also

summary, plot

Aliases
  • Desc
  • Desc.default
  • Desc.data.frame
  • Desc.list
  • Desc.formula
  • Desc.numeric
  • Desc.integer
  • Desc.factor
  • Desc.ordered
  • Desc.character
  • Desc.logical
  • Desc.Date
  • Desc.table
  • print.Desc
  • plot.Desc
Examples
# implemented classes:
Desc(d.pizza$wrongpizza)               # logical
Desc(d.pizza$driver)                   # factor
Desc(d.pizza$quality)                  # ordered factor
Desc(as.character(d.pizza$driver))     # character
Desc(d.pizza$week)                     # integer
Desc(d.pizza$delivery_min)             # numeric
Desc(d.pizza$date)                     # Date

Desc(d.pizza)

Desc(d.pizza$wrongpizza, main="The wrong pizza delivered", digits=5)

Desc(table(d.pizza$area))                                    # 1-dim table
Desc(table(d.pizza$area, d.pizza$operator))                  # 2-dim table
Desc(table(d.pizza$area, d.pizza$operator, d.pizza$driver))  # n-dim table

# expressions
Desc(log(d.pizza$temperature))
Desc(d.pizza$temperature > 45)

# supported labels
Label(d.pizza$temperature) <- "This is the temperature in degrees Celsius
measured at the time when the pizza is delivered to the client."
Desc(d.pizza$temperature)
# try as well:      Desc(d.pizza$temperature, wrd=GetNewWrd())

z <- Desc(d.pizza$temperature)
print(z, digits=1, plotit=FALSE)
# plot (additional arguments are passed on to the underlying plot function)
plot(z, main="The pizza's temperature in Celsius", args.hist=list(breaks=50))


# bivariate
Desc(price ~ operator, data=d.pizza)                  # numeric ~ factor
Desc(driver ~ operator, data=d.pizza)                 # factor ~ factor
Desc(driver ~ area + operator, data=d.pizza)          # factor ~ several factors
Desc(driver + area ~ operator, data=d.pizza)          # several factors ~ factor
Desc(driver ~ week, data=d.pizza)                     # factor ~ integer

Desc(driver ~ operator, data=d.pizza, rfrq=("111"))   # alle rel. frequencies
Desc(driver ~ operator, data=d.pizza, rfrq=("000"),
     verbose="high")                                  # no rel. frequencies

Desc(price ~ delivery_min, data=d.pizza)              # numeric ~ numeric
Desc(price + delivery_min ~ operator + driver + wrongpizza,
     data=d.pizza, digits=c(2,2,2,2,0,3,0,0) )

Desc(week ~ driver, data=d.pizza, digits=c(2,2,2,2,0,3,0,0))   # define digits

Desc(delivery_min + weekday ~ driver, data=d.pizza)


# without defining data-parameter
Desc(d.pizza$delivery_min ~ d.pizza$driver)


# with functions and interactions
Desc(sqrt(price) ~ operator : factor(wrongpizza), data=d.pizza)
Desc(log(price+1) ~ cut(delivery_min, breaks=seq(10,90,10)),
     data=d.pizza, digits=c(2,2,2,2,0,3,0,0))

# response versus all the rest
Desc(driver ~ ., data=d.pizza[, c("temperature","wine_delivered","area","driver")])

# all the rest versus response
Desc(. ~ driver, data=d.pizza[, c("temperature","wine_delivered","area","driver")])

# pairwise Descriptions
p <- CombPairs(c("area","count","operator","driver","temperature","wrongpizza","quality"), )
for(i in 1:nrow(p))
  print(Desc(formula(gettextf("%s ~ %s", p$X1, p$X2)), data=d.pizza))


# get more flexibility, create the table first
tab <- as.table(apply(HairEyeColor, c(1,2), sum))
tab <- tab[,c("Brown","Hazel","Green","Blue")]

# diplay only absolute values, row and columnwise percentages
Desc(tab, row.vars=c(3, 1), rfrq="011", plotit=FALSE)

# do the plot by hand, while setting the colours for the mosaics
cols1 <- SetAlpha(c("sienna4", "burlywood", "chartreuse3", "slategray1"), 0.6)
cols2 <- SetAlpha(c("moccasin", "salmon1", "wheat3", "gray32"), 0.8)
plot(tab, col1=cols1, col2=cols2)


# use global format options for presentation
Fmt(abs=as.fmt(digits=0, big.mark=""))
Fmt(per=as.fmt(digits=2, fmt="%"))
Desc(area ~ driver, d.pizza, plotit=FALSE)

Fmt(abs=as.fmt(digits=0, big.mark="'"))
Fmt(per=as.fmt(digits=3, leading="drop"))
Desc(area ~ driver, d.pizza, plotit=FALSE)

# plot arguments can be fixed in detail
z <- Desc(BoxCox(d.pizza$temperature, lambda = 1.5))
plot(z, mar=c(0, 2.1, 4.1, 2.1), args.rug=TRUE, args.hist=list(breaks=50),
     args.dens=list(from=0))


# Output into word document (Windows-specific example) -----------------------
# by simply setting wrd=GetNewWrd()
## Not run: 
# 
#   # create a new word instance and insert title and contents
#   wrd <- GetNewWrd(header=TRUE)
# 
#   # let's have a subset
#   d.sub <- d.pizza[,c("driver", "date", "operator", "price", "wrongpizza")]
# 
#   # do just the univariate analysis
#   Desc(d.sub, wrd=wrd)
# ## End(Not run)

Documentation reproduced from package DescTools, version 0.99.19, License: GPL (>= 2)

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