T-Test Research Papers - Academia.edu (original) (raw)

"Features: ‐Number of Samples handled (entered by user): 2 (up to 1000 observations) ‐Operations on entered samples: Automatically provided: sorted sample, Trimmed sample, Winsorized sample, random sample. ‐Descriptive... more

"Features:

‐Number of Samples handled (entered by user): 2 (up to 1000 observations)

‐Operations on entered samples:
Automatically provided: sorted sample, Trimmed sample, Winsorized sample, random sample.

‐Descriptive statistics:
Number of observations, min., max., sum, range, arithmetic mean, variance, standard deviation, mean absolute
deviation, standard error, x% confidence interval for population mean, x% lower confidence limit, x% upper
confidence limit, 1 quartile, median, 3 quartile, midspread, median absolute deviation, x% confidence interval for
population median, x% lower confidence limit, x% upper confidence limit, Tukey's trimean, skewness, kurtosis.

‐Outliers detection:
Mean, Median, Inter Quartile Range methods.

‐Hypothesis Testing:
t‐Test for independent samples: t‐Test (for the original samples), “Robust” t‐Test (for Trimmed samples, using
trimmed estimators) (+ Bullet Graphs comparing 80, 95 and 99% Confidence Interval for population Mean).
Welch’t (for both original and trimmed samples).
F‐Test for difference in variance (for both original and Trimmed samples).
Midspread comparison: for both original and Trimmed samples.
Mann‐Whitney test (+ Bullet Graphs comparing 80, 95 and 99% Confidence Interval for population Median).
Kolmogorov‐Smirnov test (for both original and Trimmed samples) (+ plot of cumulative distribution of the samples
being compared).

‐Correlation:
Pearson’s r, with confidence interval for population’s r (for both original and Trimmed samples).
Spearman’s r (for both original and Trimmed samples).
Scattergrams of Sample 1 vs Sample 2, Trimmed Sample 1 vs Trimmed Sample 2 (+ regression equation).

‐Graphics:
Box‐plots for original, trimmed, winsorized and random samples.
Box‐plots for original and trimmed samples with indication of median, mean, 1 quartile, 3 quartile, smallest&largest
non‐outlier observations.
Histograms of frequency distribution for original, trimmed, winsorized and random samples.
Histograms of frequency and cumulative distribution for original, trimmed, winsorized and random samples.
Histograms for Confidence Range of population mean for original, trimmed, winsorized and random samples.
Back‐to‐back frequency distribution histograms for original, Trimmed and random samples.
Bullet graphs for comparing 80%, 95% and 99% Confidence Range for Population Mean (for original and trimmed
samples).
Bullet graphs for comparing 80%, 95% and 99% Confidence Range for Population Median (for original and trimmed
samples).
Plot of cumulative distribution of the samples being compared.
Scattergrams of correlation between Samples."