DSS Research: Statistical Power Calculator

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  Phone: 817.665.7000
  Fax: 817.665.7001
  
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  Suite 700
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  Phone: 703.351.5040
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You are here: Knowledge Center > Toolkit Calculators > Statistical Power Calculators

Researcher's Toolkit

Enter "Test Value"
Enter "Sample Average"
Enter "Sample Size"
Enter "Standard Deviation Value For Sample"
"Test Value" and "Sample Average" can not be equal
Please enter a value greater than '0' for "Sample Size"
Please enter a value greater than '0' for "Standard Deviation for Sample"
Please enter valid value for "Test Value"
Please enter valid value for "Sample Average"
Please enter valid value for "Sample Size"
Please enter valid value for "Standard Deviation for Sample"

One-Tail Test (Hypothesis that Average is greater than some test value or Average is less than some test value, but not both)
Two-Tail Test (Hypothesis that Average is greater than some test value or Average is less than some test value, but not both)

Enter the average value for the sample and a value to compare it to. Also enter the sample size and standard deviation for the sample or rough estimates of them. For reference, a 5-pt. scale may typically have a standard deviation of 0.8 to 1.2 and a 10-pt scale may have a standard deviation between 3.0 and 4.0 for most items. The larger the standard deviation, the larger the sampling error.

Test Value:

(Value to compare the sample average to)
Sample Average:

(Value measured from sample or expected from sample)
Sample Size:

(Size of sample or desired number of respondents)
Standard Deviation for Sample:
Alpha Error Level or Confidence Level:

(Probability of incorrectly rejecting the null hypothesis that there is no difference in the average values). An Alpha of 5% corresponds to a 95% Confidence Interval.
Results will be displayed here.

Enter "Average Value for Sample 1"
Enter "Average Value for Sample 2"
Enter "Sample Size 1"
Enter "Sample Size 2"
Enter "Standard Deviation for Sample 1"
Enter "Standard Deviation for Sample 2"
"Average Value for Sample 1" and "Average Value for Sample 2" can not be equal
Please enter a value greater than '0' for "Sample Size 1"
Please enter a value greater than '0' for "Sample Size 2"
Please enter a value greater than '0' for "Standard Deviation for Sample 1"
Please enter a value greater than '0' for "Standard Deviation for Sample 2"
Please enter valid value for "Average Value for Sample 1"
Please enter valid value for "Average Value for Sample 2"
Please enter valid value for "Sample Size 1"
Please enter valid value for "Sample Size 2"
Please enter valid value for "Standard Deviation for Sample 1"
Please enter valid value for "Standard Deviation for Sample 2"

One-Tail Test (Hypothesis that the Average for Sample 1 is greater than the Average for Sample 2 or Average 1 is less than Average 2, but not both)
Two-Tail Test (Hypothesis that the Average for Sample 1 is greater than the Average for Sample 2 or Average 1 is less than Average 2, but not both)

Enter the average value for Sample 1 and the average value for Sample 2. Also enter the sample sizes and standard deviations for each sample or rough estimates of them. For reference, a 5-pt. scale may typically have a standard deviation of 0.8 to 1.2 and a 10-pt scale may have a standard deviation between 3.0 and 4.0 for most items. The larger the standard deviation, the larger the sampling error.

Average Value for Sample 1:

(Value measured from Sample 1 or expected from it)
Average Value for Sample 2:

(Value measured from Sample 2 or expected from it)
Size of Sample 1:

(Size of Sample 1 or desired number of respondents)
Size of Sample 2:

(Size of Sample 2 or desired number of respondents)
Standard Deviation for Sample 1:
Standard Deviation for Sample2:
Alpha Error Level or Confidence Level:

(Probability of incorrectly rejecting the null hypothesis that there is no difference in the average values). An Alpha of 5% corresponds to a 95% Confidence Interval.
Results will be displayed here.

Please enter a value for the "Test Value Percentage" field
Please enter a value for the "Sample Percentage" field
Please enter a value for the "Size of Sample" field
Please enter valid value for "Test Value Percentage"
Please enter valid value for "Sample Percentage"
Please enter valid value for "Size of Sample"
"Test Value Percentage" and "Sample Percentage" values can not be equal
Please enter a value greater than "0" and less than "100" in the "Test Value Percentage" field
Please enter a value greater than "0" and less than "100" in the "Sample Percentage" field
Please enter a value greater than "0" in the "Size of Sample" field

One-Tail Test (Hypothesis that Percentage is greater than some test value or Percentage is less than some test value, but not both)
Two-Tail Test (Hypothesis that Percentage is not equal to some test value)

To calculate the minimum possible statistical power, use a test value of 50% which produces the largest possible variance (also known as the "Most Pessimistic Variance Assumption").

Test Value (%):

(Value to compare the sample percentage to)
Sample(%):

(Value measured from sample or expected from sample)
Sample Size:

(Size of sample or desired number of respondents)
Alpha Error Level or Confidence Level:

(Probability of incorrectly rejecting the null hypothesis that there is no difference in the percentage values). An Alpha of 5% corresponds to a 95% Confidence Interval.
Results will be displayed here.

Please enter a value for the "Sample 1 Percentage" field.
Please enter a value for the "Sample 2 Percentage" field.
Please enter a value for the "Size of Sample 1" field.
Please enter a value for the "Size of Sample 2" field.
Please enter valid value for "Sample1 Percentage"
Please enter valid value for "Sample2 Percentage"
Please enter valid value for "Sample Size 1"
Please enter valid value for "Sample Size 2"
"Sample1 Percentage" and "Sample2 Percentage" values can not be equal
Please enter a value greater than "0" and less than "100" in the "Sample1 Percentage" field
Please enter a value greater than "0" and less than "100" in the "Sample2 Percentage" field
Please enter a value greater than "0" and less than "100" in the "Size of Sample1" field
Please enter a value greater than "0" and less than "100" in the "Size of Sample2" field

One-Tail Test (Hypothesis that Sample 1's Percentage is greater than Sample 2's value or Sample 1's Percentage is less than Sample 2's value, but not both)
Two-Tail Test (Hypothesis that Sample 1's Percentage is not equal to Sample 2's Percentage value)

To calculate the minimum possible statistical power, set one percentage value to 50% which produces the largest possible variance (also known as the "Most Pessimistic Variance Assumption").

Sample1 Percentage (%):

(Value measured from Sample 1 or expected from this sample)
Sample2 Percentage (%):

(Value measured from Sample 2 or expected from this sample)
Size of Sample 1:

(Size of Sample 1 or desired number of respondents)
Size of Sample 2:

(Size of Sample 2 or desired number of respondents)
Alpha Error Level or Confidence Level:

(Probability of incorrectly rejecting the null hypothesis that there is no difference in the percentage values). An Alpha of 5% corresponds to a 95% Confidence Interval.
Results will be displayed here.

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Researcher's Toolkit

History

Resources

Certifications and Approvals

Contact Us

Industry Programs Solutions Group

Custom Research Solutions Group

Strategy Research Solutions Group

Health Insurance

Health Care Providers

Medical Device

Other

Webinars

Calculators

Research and POV from DSS

Facebook

Twitter

Linked In

News Release

Newsletter

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Researcher's Toolkit