NPCT

Stixbox is a useful set of functions (under the GPL) for doing statistical work in Matlab. Here’s the contents file:

Distribution functions.
dbeta – Beta density function.
dbinom – Binomial probability function.
dchisq – Chisquare density function.
df – F density function.
dgamma – Gamma density function.
dhypg – Hypergeometric probability function.
dlognorm – The log-normal density function.
dnorm – Normal density function.
dt – Student t density function.
dweib – The Weibull density function.
dgumbel – The Gumbel density function.

pbeta – Beta distribution function.
pbinom – Binomial cumulative probability function.
pchisq – Chisquare distribution function.
pf – F distribution function.
pgamma – Gamma distribution function.
phypg – Hypergeometric cumulative probability function.
plognorm – The log-normal distribution function.
pnorm – Normal distribution function.
pt – Student t cdf.
pweib – The Weibull distribution function.
pgumbel – The Gumbel distribution function.

qbeta – Beta inverse distribution function.
qbinom – Binomial inverse cdf.
qchisq – Chisquare inverse distribution function.
qf – F inverse distribution function.
qgamma – Gamma inverse distribution function.
qhypg – Hypergeometric inverse cdf.
qlognorm – The inverse log-normal distribution function.
qnorm – Normal inverse distribution function.
qt – Student t inverse distribution function.
qweib – The Weibull inverse distribution function.
qgumbel – The Gumbel inverse distribution function.

rbeta – Random numbers from the beta distribution.
rbinom – Random numbers from the binomial distribution.
rchisq – Random numbers from the chisquare distribution.
rf – Random numbers from the F distribution
rgamma – Random numbers from the gamma distribution.
rhypg – Random numbers from the hypergeometric distribution.
rlognorm – Log-normal random numbers.
rnorm – Normal random numbers (use randn instead).
rt – Random numbers from the student t distribution.
rweib – Random numbers from the Weibull distribution.
rgumbel – Random numbers from the Gumbel distribution.

Logistic regression.
ldiscrim – Compute a linear discriminant and plot the result.
logitfit – Fit a logistic regression model.
lodds – Log odds function.
loddsinv – Inverse of log odds function.

Various functions.
bincoef – Binomial coefficients.
cat2tbl – Take category data and produce a table of counts.
getdata – Some famous multivariate data sets.
quantile – Empirical quantile (percentile).
ranktrf – Rank transform data.
spearman – Spearman’s rank correlation coefficient.
stdize – Standardize columns to have mean 0 and standard deviation 1.
corr – Correlation coefficient.
cvar – Covariance.

Resampling methods.
covjack – Jackknife estimate of the variance of a parameter estimate.
covboot – Bootstrap estimate of the variance of a parameter estimate.
stdjack – Jackknife estimate of the parameter standard deviation.
stdboot – Bootstrap estimate of the parameter standard deviation.
rboot – Simulate a bootstrap resample from a sample.
ciboot – Bootstrap confidence interval.
test1b – Bootstrap t test and confidence interval for the mean.

Tests, confidence intervals, and model estimation.
cmpmod – Compare small linear model versus large one.
contincy – Test for contigency table row-column independence.
ciquant – Nonparametric confidence interval for quantile.
lsfit – Fit a least squares model.
lsselect – Select a predictor subset for regression.
test1n – Tests and confidence intervals, one normal sample.
test1r – Test for median equals 0 using rank test.
test2n – Tests and confidence intervals, two normal samples.
test2r – Test for equal location of two samples using rank test.
normmix – Estimate a mixture of normal distributions.

Graphics.
qqgamma – Gamma probability paper plot (and estimate).
qqnorm – Normal probability paper plot.
qqplot – Plot empirical quantile vs empirical quantile.
qqweib – Weibull probability paper plot.
qqgumbel – Gumbel probability paper plot.
kaplamai – Plot Kaplan-Maier estimate of survivor function.
linreg – Linear or polynomial regression, including plot.
histo – Plot a histogram (alternative to hist).
plotsym – Plot with symbols.
plotdens – Draw a nonparametric density estimate.
plotempd – Plot empirical distribution.
identify – Identify points on a plot by clicking with the mouse.
pairs – Pairwise scatter plots.

Thursday, April 21st, 2005 at 7:17 pm.
Filed under Research, Science and Math.
Subscribe to RSS 2.0.
Skip to the end and leave a comment. Pinging disabled.