Description Usage Arguments Details Value Author(s) Examples
Produces table of relevant descriptive statistics and inference for either one or twosample ttest. In the twosample case, the user can specify whether or not equal variances should be presumed. Can also perform a test of equality of proportions, with the appropriate Wald or exact binomial based confidence intervals.
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obs 
number of observations for the first sample. 
mean 
the sample mean of the first sample. 
sd 
the sample standard deviation of the first sample. 
obs2 
number of observations for the second sample (this is optional). 
mean2 
if 
sd2 
if 
null.hyp 
a number specifying the null hypothesis for the mean (or difference in means if performing a twosample test). Defaults to zero. 
alternative 
a string: one of 
level 
confidence level of the test. Defaults to 95/100. 
var.eq 
a logical value, either 
prop 
if 
exact 
must be 
Values must be placed in the specified spaces, in place of the defaults. If obs2
, mean2
, or sd2
is specified, then all three must be specified and a twosample ttest is run.
Prints a summary of the data and the corresponding ttest.
Variable 

Obs 
Number of observations of each variable: includes missing values. 
Mean 
the sample mean; also, the estimated difference in means in a twosample test. 
Std.Err. 
the estimated standard error of the mean and of the difference in the twosample test. 
Std.Dev. 
standard deviation estimates. 
CI 
a confidence interval for the means, and for the difference in the twosample test. This is at the confidence level specified in the argument. If 
Null hypothesis 
a statement of the null hypothesis. 
Alternative hypothesis 
a statement of the alternative hypothesis. 
t 
value of the tstatistic. 
df 
the degrees of freedom for the test. 
Pr 
a pvalue for inference on the corresponding hypothesis test. 
Scott S. Emerson, M.D., Ph.D., Andrew J. Spieker, Brian D. Williamson, Travis Y. Hee Wai, Solomon Lim
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