Let's define this object:
> welch <- t.test(x,y,alt="less",var.equal=TRUE)
Then, if you type
> names(welch)
You get its contents:
[1] "statistic" "parameter" "p.value"
"conf.int" "estimate"
[6] "null.value" "alternative" "method"
"data.name"
Now, to obtain the value of each of its elements, you use the '$' sign,
as in:
> welch$statistic
t
-0.533114 > welch$parameter
df
18
Etc.
Hope this helps,
Jos?
Jos? Iparraguirre
Chief Economist
Age UK
T 020 303 31482
E Jose.Iparraguirre at ageuk.org.uk
Twitter @jose.iparraguirre at ageuk
Tavis House, 1- 6 Tavistock Square
London, WC1H 9NB
www.ageuk.org.uk?| ageukblog.org.uk | @ageukcampaigns
For a copy of our new Economic Monitor and the full Chief Economist's
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http://www.ageuk.org.uk/professional-resources-home/knowledge-hub-evidence-statistics/
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-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of cosworth201
Sent: 07 November 2012 15:27
To: r-help at r-project.org
Subject: [R] Welch Two Sample T-Test
I know when I enter this into R:> x = c(15, 10, 13, 7, 9, 8, 21, 9, 14, 8)
> y = c(15, 14, 12, 8, 14, 7, 16, 10, 15, 12)
> t.test(x,y,alt="less",var.equal=TRUE)
it shows:
Two Sample t-test
data: x and y
t = -0.5331, df = 18, p-value = 0.3002
alternative hypothesis: true difference in means is less than 0
95 percent confidence interval:
-Inf 2.027436
sample estimates:
mean of x mean of y
11.4 12.3
I need to write out the entire function and give this same result but
without t.test(x,y,alt="less",var.equal=TRUE). I need to print out the
value
for t, df, pvalue as well as the confidence, etc. How exactly do I go about
doing that?
--
View this message in context:
http://r.789695.n4.nabble.com/Welch-Two-Sample-T-Test-tp4648713.html
Sent from the R help mailing list archive at Nabble.com.
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
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