Descriptive Statistics

Description

This tool computes a suite of descriptive statistics on one or more variables. The following descriptive statistics are computed: minimum, 25th percentile, mean, median, 75th percentile, maximum, standard deviation, variance, skewness, and kurtosis. A Shapiro-Wilk normality test is also run, which will test each variable for normality (null hypothesis = data are normal). The results are output under "Output Statistics" and to the output file specified by the user.

Input

File
Select the input data to analyze by clicking on "Browse" and navigating to the proper file.

Input Data Format
Year / Data

Each "/" is a tab (i.e., data should be tab-delimited). Missing Data should be denoted as "-99".

Start Row
This input is the row number where the main data to be processed begin in the input file selected above. An example of how row numbers are entered is shown in Figure 2 located in the Running Dendro Tools topic.

Number of Variables
Enter the number of variables located in the input file. Descriptive statistics will be computed for each variable.

Start Year
Enter the year to start the computation of descriptive statistics.

End Year
Enter the year to end the computation of descriptive statistics.

Output

File
Select or enter the name of the file where the results will be stored.

Header
Information entered here will be output in the first line of the output file.