Displaying 3 results from an estimated 3 matches for "byfactor".
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myfactor
2011 Nov 15
2
using tapply() with the quantile function?
Hi:
Summary:
I am trying to determine the 90th percentile of ambulance response times for groups of data.
Background:
A fire chief would like to look at emergency response times at the 90th percentile for 1 kilometer grids in Cape Coral, Florida. I have mapped out ambulance response times on a GIS map. Then I superimpose a regularly-spaced grid over the response times and spatially join the
2009 Nov 14
4
Weighted descriptives by levels of another variables
I've noticed that R has a number of very useful functions for
obtaining descriptive statistics on groups of variables, including
summary {stats}, describe {Hmisc}, and describe {psych}, but none that
I have found is able to provided weighted descriptives of subsets of a
data set (ex. descriptives for both males and females for age, where
accurate results require use of sampling
2007 Mar 07
5
how to "apply" functions to unbalanced data in long format by factors......cant get "by" or "aggregate" to work
Hello R users,
Problem.......I do not understand how to use "aggregate","by", or the
appropriate "apply" to perform a function on data with more than one
factor on unbalanced data...
I have a data frame in the long format that does not contain balanced
data. The ID is a unique identifier corresponding to the experimental
unit that will later be examined by ANOVA,