Statistical Analysis

OCS offers several statistical analysis functions which perform a variety of analyses. The functions can analyze one dataset at a time, or, using a job file, do multiple analyses in one sitting. Datasets can be merged for analysis, and variable files can be used to choose exactly which portions of the dataset to analyze.

The analysis functions are modular. You can choose which functions you would like to have enabled when you order. In addition, TRC can remotely enable any of the statistical functions at any time using the Feature Access Control System (FACS).

Each statistical function is a powerful and useful research tool.

OCS Report

The OCS Report is a summary of the data in a given dataset. It lists all the records in that Dataset, complete with record numbers, codes, timecodes and descriptions. The OCS Report is the only statistical function automatically enabled in OCS.

Summary Statistics Report

The Summary Statistics (SumStat) Report shows information concerning the frequency and duration of events within a dataset. The duration statistics include minimum, maximum, and mean duration; standard deviation from mean duration; and total duration.

Agreement Report

The Agreement Report compares two datasets taken over the same timeframe and identifies all the agreements between the two datasets. As part of this process, the user must specify a time interval or tolerance in which matching codes must be found in both datasets. This time tolerance is used to allow for the differences in coders' reaction times.

In addition to identifying agreements and disagreements, the program shows the time difference between corresponding observations. It also calculates Percent Agreement and Cohen's Kappa, which corrects for chance agreement.

The information created by the Agreement Report can be used in various interrater reliability calculations. It is also helpful for identifying inconsistencies between coders and in training coders to comply with established standards.

Interval Report

The Interval Report breaks the dataset up into periods of time called intervals, and gives various information gathered on that basis. It analyzes the intervals within a dataset and calculates the frequency and duration within the intervals. It also calculates the rate of occurrence of events within the intervals.

Duration Report

The Duration Report is focused on the amount of time events cover. It is used to calculate the duration of individual events within a dataset, and the cumulative duration of a given event or events in a dataset. The report lists the consecutive events within a Dataset. Each line of the report includes the duration of each individual incident as well as the cumulative duration of each event.

Pattern Report

The Pattern Report seeks and displays occurrences of specific user-defined sequences within the dataset. It allows the user to specify a sequence of up to 10 codes within a dataset and search for all the occurrences of that exact sequence. The system also lists the time and record numbers of each code in each sequence.

Time Series Comparison Report

The Time Series Comparison (TSC) Report aligns two or more datasets in a manner which allows the user to easily pinpoint similarities and differences between them. It can compare up to eight datasets over a common time period. The information is displayed in a parallel format, allowing the user to compare the datasets and their coded events in a progressive timeline. The timeline consists of all the times a requested code was entered into any of the datasets.

Sequential Analysis Dataset

The Sequential Analysis Report is intended to convert OCS data into data that can be used by SDIS, a sequential analysis program created by Roger Bakeman, Ph.D. and Vicenc Quera, Ph.D.