Methadology

1. Power and sample size
http://biostat.mc.vanderbilt.edu/wiki/Main/PowerSampleSize

◦ used to calculate the power and the sample size of any survey.
◦ mostly used in domains such as biology, bio-statistics, the social Sciences,

agriculture and medicine.
◦ can be used for studies with dichotomous continues or survival response

measures.
◦ This is a handle tool meant for students, professionals and researchers

with at least minimal statistical knowledge.
◦ A cardinal advantage of the PS: power and sample size calculator is that it

can be used in various study designs like T-test, regression, design and
analysis of experiment, analysis of variance, correlation and revival test.
◦ can generate graphs that make it less stressful to analyze the relationship
between the power of the survey, sample size and the detectable
alternative hypothesis.

2. Epi – Info Software
http://wwwn.cdc.gov/epiinfo/html/downloads.htm

— These utilities can be used to calculate required
sample sizes to estimate a population mean or
proportion, to detect significant differences between
two means or two proportions or to estimate a true
herd-level prevalence

3. Power Analysis and Sample Size (PASS) – most powerful but
have to buy the license first.
http://www.ncss.com/pass.html

— Helps to calculate the power and sample size of a research/survey.
— Most times researchers make the mistake of rejecting a true null hypothesis (Ho).

The power of the test needs to be ascertained as a guide in knowing if the
research is making the right decision i.e. rejecting a null hypothesis that is
actually false and accepting its alternative or vice-versa.
— helps in determining if the research is judge “powerful” by placing it on a
probability scale of 0 to 1. A value close to 1 indicates a very powerful research or
a research that rejected the hypothesis to be rejected and accepts the one that
should be accepted. A value close to 0 indicate a weak research or survey whose
generalization or recommendations may be false.
— helps to ascertain the actual sample size to be used and hence, make the test
powerful.

4.The Raosoft Sample Calculator
http://raosoft.com/samplesize.html

— is basically a software that primarily calculates or generates
the sample size of a research or survey.

— Estimating a sample size for a survey, project or research can
be confusing and frustrating, as a result, the Raosoft sample
size calculator offers both sample size confidence interval
calculation to minimize these frustrations encountered during
research.

— This software takes into account the margin of error, the
confidence level and response distribution. It also offers to
show viz-a-viz what the margin of error would be like with
various sample sizes.

5. THE SURVEY SYSTEM SURVEY
http://ncss.com/software/pass

— This has features which enables a researcher to conduct
sophisticated surveys and produce professional report.

— can record any typed of answer and even records respondent actual
voice with the help of VOICE CAPTURE SURVEY MOUDLE.

— This software helps to guide respondent through correct questions,
helps to modify questions to generate or yield more accurate data
and equally check the validity of answers given.

— This software is mostly useful to researchers involved in field
survey or research.

— This survey software also helps researchers in creating unique
survey and helps to distribute researchers’ questionnaires
adequately online for adequate data.

— This software is the most complete software package available for
working with survey questionnaires.