Create Stability Study Worksheet
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Create Stability Study Worksheet
Stat > Regression > Stability Study > Create Stability Study Worksheet
Generate a worksheet to help you collect and analyze data for a stability study.
In a typical stability study, you test multiple batches of a product over time to determine the shelf life. For example, you might test 2 pills from each of 5 batches every 3 months.
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Test times in numeric format, at varying intervals: Choose to enter the test times as the age of the product, and to vary the amount of time between tests. For example, you can enter 0, 3, and 9 to indicate that samples are analyzed when the product is first created (Time 0), when the product is 3 months old, and when the product is 9 months old.
Number of test times: Enter the number of times that you will test each batch during the study.
Unit of time: Specify whether you will measure the intervals in days, months, years, or a different unit of time.
Month (or other label): Enter the times at which you will test the product.
Number of batches: Enter the number of batches that you will test for the study.
Batch Name: Change the labels that identify the batches.
Test times in numeric format, at constant intervals: Choose to enter the test times as the age of the product and to specify the same amount of time between each test. For example, you can specify that samples are analyzed when the product is created (Time 0), and then every month for 2 years, for a total of 25 test times.
Number of test times: Enter the number of times that you will test each batch during the study.
Starting time: Enter the age of the product at the first test time. For example, 0 indicates that you will test the product as soon as you create it.
Interval length: Enter the amount of time between tests. For example, you can enter 4 to indicate that the test times are 4 months apart.
Unit of time: Specify whether you will measure the intervals in days, months, years, or a different unit of time.
Number of batches: Enter the number of batches that you will test for the study.
Batch Name: Change the labels that identify the batches.
Test times in date/time format, at varying intervals: Choose to enter the date of each test and to vary the amount of time between tests. For example, you can enter a series of dates that start with 1/1/2014, 4/1/2014, 10/1/2014.
Number of test times: Enter the number of times that you will test each batch during the study.
Starting time: Enter the date of the first test. This is usually the day that you create the product.
Number of batches: Enter the number of batches that you will test for the study.
Batch Name: Change the labels that identify the batches.
Test times in date/time format, at constant intervals: Choose to enter the date of each test and to specify the same amount of time between each test. For example, use this option if you analyze samples on 1/1/2014, and then every month for 2 years, for a total of 25 test times.
Number of test times: Enter the number of times that you will test each batch during the study.
Starting time: Enter the date of the first test. This is usually the day that you create the product.
Interval length: Enter the amount of time between tests. For example, you can enter 4 to indicate that the test times are 4 months apart.
Unit of time: Specify whether you will measure the intervals in days, months, or years.
Number of batches: Enter the number of batches that you will test for the study.
Batch Name: Change the labels that identify the batches.
Use test times from columns in worksheet: Choose to enter test times that are stored in columns in the worksheet. Each column must contain the test times for 1 batch.
Test times (one column per batch): Enter the columns that contain the test times. The columns can be numeric or date/time.
Number of samples from each batch at each time (repeats): Enter the number of individual samples that you will test from each batch at each time.
<Options> (This button is not available if you choose Use test times from columns in worksheet.)