Frequency Tally Sheet
- It is used to display quantitative data
- It is used to count the frequency of the sampled data based on
design criteria
When should we use the frequency tally sheet?
- To easily and efficiently collect and organize data.
- To collect data on the frequency of certain events, i.e., after
the causes of a problem have been analyzed and selected, as a first
step in the Pareto Analysis.
How do we develop useful frequency tally sheet?
- Review the steps of the process, or the causes of the problem to
observe.
- Make a list of examples to observe. Include only the information
you intend to use. Leave some room for unexpected events.
- Decide on the time interval for observing the events (number of
days).
- You can use external observation of the process to measure frequencies,
or ask users or workers to use tally sheets themselves in their daily
work. An observation of every event is registered by a check in the
corresponding cell of the sheet each time the event occurs.
- The frequency is calculated by adding up the number of events in
the last column. The data will serve as the basis for the creation
of a Pareto Graph.
Tips:
- Make sure people interpret the categories in the same way, using
agreed upon operational definitions.
- Keep separate tally sheets for different days, different people,
and so on. That way you can look for patterns related to those factors.
Examples:
Sources:
http://www.nt.gov.au/health/healthdev/health_promotion/bushbook/volume1/analyse.html
http://erc.msh.org/quality/pstools/pstally1.cfm
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