This procedure is available in both the Analyse-it Standard and the Analyse-it Method Evaluation edition
Cochran test is a non-parametric test for a difference in proportion in two or more paired dichotomous samples.
The requirements of the test are:
Data in existing Excel worksheets can be used and should be arranged in a List dataset layout. The dataset must contain at least two nominal or ordinal scale variables dichotomised by the same groups and criteria.
When entering new data we recommend using New Dataset to create a new k variables (categorical) dataset ready for data entry.
To start the test:
Excel 97, 2000, 2002 & 2003:
Select any cell in the range containing the dataset to analyse, then click Analyse on the Analyse-it toolbar, click Compare Pairs then click Cochran.
The report shows the number of observations analysed, and, if applicable, how many missing values were excluded. The number of observations of each group in each sample are summarised in a contingency table.
The Cochran statistic and hypothesis test are shown. The p-value is the probability of rejecting the null hypothesis, that the samples have the same proportions in each group, when it is in fact true. A significant p-value implies that at least two samples have different proportions in each group.
METHOD The p-value is calculated using the chi-square approximation (see ).
We've been developing intuitive high-quality statistical software at an affordable price, backed up by fast friendly customer service for over 25 years...
Office hours: 9am-5pm GMT Mon-Fri
It's Tuesday 5:02 PM and the office is closed - e-mail us and we'll get back to you as soon as possible.