On Jan 30, 2011, at 5:48 AM, arindam fadikar wrote:
Dear all,
Given data of a continuous frequency distribution with class
intervals ..
how to enter such data so that we can use the normal mean, median
and mode
functions to calculate them and also can draw histogram ..
for example how to enter this data in R
Height range[image:
↓]<http://en.wikipedia.org/wiki/Frequency_distribution#> Number
of students[image: ↓]
<http://en.wikipedia.org/wiki/Frequency_distribution#> Cumulative
number[image: ↓] <http://en.wikipedia.org/wiki/
Frequency_distribution#> 4.5–5.0
feet 25 25 5.0–5.5 feet 35 60 5.5–6 feet 20 80 6.0–6.5 feet 20
100
The textConnection function allows you to simulate file input from
material cut and pasted from text sources:
> dtabl <- read.table(textConnection("4.5–5.0 feet 25 25 \n5.0–5.5
feet 35 60 \n5.5–6 feet 20 80 \n6.0–6.5 feet 20 100"),
header=FALSE, stringsAsFactors=FALSE)
> names(dtabl) <- c("Interval", "units", "Freq", "Cum_Freq")
> dtabl
Interval units Freq Cum_Freq
1 4.5–5.0 feet 25 25
2 5.0–5.5 feet 35 60
3 5.5–6 feet 20 80
4 6.0–6.5 feet 20 100
You may need to remove extraneous linefeeds inserted by our mail
clients.
--
David Winsemius, MD
West Hartford, CT
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