stat.pen: Pennington statistics on a data frame or time series

In pastecs: Package for Analysis of Space-Time Ecological Series

Description

Compute a table giving various descriptive statistics, including Pennington's estimators of the mean, the variance and the variance of the mean, about the series in a data frame or in a single/multiple time series

Usage

stat.pen(x, basic=FALSE, desc=FALSE)

Arguments

x	a data frame or a time series
basic	do we have to return also basic statistics (by default, it is FALSE)? These are: the number of values (nbr.val), the number of null values (nbr.null), the number of missing values (nbr.na), the minimal value (min), the maximal value (max), the range (range, that is, max-min) and the sum of all non-missing values (sum)
desc	do we have to return also various descriptive statistics (by default, it is FALSE)? These are: the median (median), the mean (mean), the standard error on the mean (SE.mean), the confidence interval of the mean (CI.mean) at the p level, the variance (var), the standard deviation (std.dev) and the variation coefficient (coef.var) defined as the standard deviation divided by the mean

Value

a data frame with the various statistics in rows and with each column correponding to a variable in the data frame, or to a separate time series

Note

If you prefer to get separate statistics for various time intervals in your time series, use stat.slide(). Various other descriptive statistics, including test of the normal distribution are also available in stat.desc()

Author(s)

Frédéric Ibanez ([e-mail]), Philippe Grosjean ([e-mail])

References

Aitchison, J., 1955. On the distribution of a positive random variable having a discrete probability mass at the origin. J. Amer. Stat. Ass., 50:901-908.

Pennington, M., 1983. Efficient estimations of abundance for fish and plankton surveys. Biometrics, 39:281-286.

See Also

stat.slide, stat.desc

Examples

data(marbio)
stat.pen(marbio[,c(4, 14:16)], basic=TRUE, desc=TRUE)

Example output

Loading required package: boot
             Copepodits2     Oithona Acanthaires Cladocerans
nbr.val        68.000000      68.000   68.000000   68.000000
nbr.null        5.000000       0.000    8.000000   45.000000
percnull        7.352941       0.000   11.764706   66.176471
nbr.na          0.000000       0.000    0.000000    0.000000
median         24.500000    1228.000   12.000000    0.000000
mean           39.632353    1546.456   14.514706    5.794118
var          1619.877744 1642971.655  144.731124  626.762950
std.dev        40.247705    1281.785   12.030425   25.035234
pos.median     28.000000    1228.000   13.000000    4.000000
pos.mean       42.777778    1546.456   16.450000   17.130435
pos.var      1613.788530 1642971.655  131.980508 1705.754941
pos.std.dev    40.171987    1281.785   11.488277   41.300786
geo.mean       31.504949    1161.198   12.030807    6.482851
pen.mean       38.604561    1624.345   16.011929    4.183929
pen.var      1302.882154 2463485.626  389.856084  144.116540
pen.std.dev    36.095459    1569.549   19.744774   12.004855
pen.mean.var   18.476177   34230.002    5.325181    1.900941

pastecs documentation built on May 2, 2019, 3:36 p.m.