Displaying 3 results from an estimated 3 matches for "fishlength".
2008 Aug 09
2
how to interpret t.test output
...pret the output of
# a t.test in plain english?
# Based on the t.test below I can say that
# I reject the null hypothesis because
# the p-value is smaller than the the significance
# level(alpha=0.05). What else can I conclude here?
Ho = 36 mm
Ha <> 36 mm
fishlength <- c(35,32,37,39,42,45,37,36,35,34,40,42,41,50)
t.test(fishlength,mu=36)
One Sample t-test
data: fishlength
t = 2.27, df = 13, p-value = 0.04087
alternative hypothesis: true mean is not equal to 36
95 percent confidence interval:
36.14141 41.71573
sample estimates:
mean of x
38.92...
2008 Aug 10
2
detect if data is normal or skewed (without a boxplot)
...I want to integrate R to this application to estimate confidence intervals on fish sizes (mm). I basically want to automate the process from Excel by detecting if my data has a normal distribution then use t.test, but if my data is skewed then use wilcox.test. Something like the pseudo code below:
fishlength <- c(35,32,37,39,42,45,37,36,35,34,40,42,41,50)
if fishlength= "normally distributed" then
t.test(fishlength)
else
wilcox.text(fishlength)
I hope this isn't very confussing
Felipe D. Carrillo
Supervisory Fishery Biologist
Department of the Interior
US Fish & Wildl...
2008 Mar 13
1
Fit a logit curve to the data
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