Most of the data in NEO CANDO are updated annually. The Census data are the exception. The
Census of the Population occurs every ten years. Many of the data are available from 1990 to
the most current year. However, this will vary by data source. Only census, vital statistics and
HMDA data are available for the 16 counties outside Cuyahoga County. The following
information provides the user with some general information and caveats regarding the data in
NEO CANDO. However, we encourage the user to read the data documentation for each of the
data sources we provide to understand how we calculate the indicators, precautions and caveats
about using the data, and how to appropriately cite the data from NEO CANDO.
Infrequent event problem
There are some events that occur infrequently (infant deaths, homicides), and the user should be
cautioned in using these numbers to calculate annual rates at the neighborhood or census tract
level. The fluctuation from year to year could be an anomaly rather than a trend. In these cases,
it is suggested that a three-year average, or even five-year average, be used to calculate the rate
to "smooth" any fluctuations that are not meaningful. For example, the infant mortality rate is an
example where the rate may be unreliable due to the small number of infant deaths. To illustrate
calculating a three year average:
|Year ||Infant deaths ||Live births|
|1994 ||15|| 200|
|1995 ||6 ||205|
|1996 ||4 ||199|
Three year average = 25/604*1000 = 41 infant deaths per 1000 live births (infant mortality rate)
In order to compare the data over time, choose the three years prior to 1994 and calculate a
three-year average for this time period also.
Rate versus Count
Most data in NEO CANDO are reported in counts and rates. To determine which is more
appropriate for your use, consider the following:
A count would be used when you want to determine the magnitude of a problem/issue that needs
to be addressed. For example, it would be important to know the actual number of births to first
time mothers or teen mothers to determine the need for a nurse visitation program geared toward
these new mothers.
A rate would be used when comparing across geographic areas or over time periods. A rate
measures the probability of an event occurring in a particular area during a particular time period.
Using the above example, a rate might be used to determine the geographic areas that are more
likely to have a higher rate of births to teens or first time mothers in order to target the nurse
visitation program to areas of greater need.
A percent is a rate per 100. Poverty rates are per 100 population. Poverty rate is the same as
percent poor. Rates per 1,000 are commonly used when reporting vital statistics related
indicators. Rates per 100,000 are commonly used when reporting crime related statistics. The
"per" number is called the multiplier. When calculating a rate you need 3 pieces of information –
the numerator, the denominator and the multiplier. For example, to calculate the poverty rate we
need to know the number of persons living below poverty (numerator), the total number of
persons for whom poverty status is determined (population living below poverty + population
living above poverty) (the denominator) and the "100".
It will be clear in NEO CANDO what indicators are rates – the multiplier (1,000 or 100,000)
or the word "rate" is included in the indicator name.
In NEO CANDO, we do have one ratio – the adult/child ratio. The adult/child ratio simply divides
the number of adults by the number of children to determine how many adults there are per child.
If there are 100 adults and 50 children – the ratio would be 2 adults for every child – 100 divided
by 50 = 2.
Medians are used to report income, rent and housing value in CANDO. The median represents
the middle value in a distribution. The median divides the total frequency into two equal parts.
Half of the distribution has a value above the median and half of the distribution has a value
below the median.
When comparing indicators across geographic areas or time periods, it is important to consider
structural, geographic and economic variations that may contribute to the differences in the rate.
Population counts used in denominators
Denominators in rates are usually, but not always, the residential population. Rates are also
computed using other denominators, such as teenage female population when computing the
teen birth rates. Census tracts, in general, have a low population, and we caution the user in
interpreting rates at this geographic level. Three-year averages or aggregating tracts could be
used to avoid the low population issue. This is particularly important when calculating rates
based on specific population groups rather than on the entire population. We consider tracts with
a population less than 100 to be non-residential, and therefore consider rates calculated using
these tracts to be unreliable.
The neighborhoods of Downtown and Industrial Valley are non-residential areas and rates
calculated based on these areas should be viewed cautiously.
Population in non-census years
The population of the census tract or neighborhood is used to calculate many of the rates within
NEO CANDO. The Census of the Population occurs every ten years on the decade. In order to
calculate the population between census years, we use linear interpolation and extrapolation
techniques. We are unable to release the tract level population estimates. However, the annual
population estimates for the counties and places as a whole are available from the Census
Much of the data the Center receives is at the address level. In order to determine what census
tract the address is located in, the Center geocodes the data. Geocoding assigns latitude and
longitude, 2000 census tracts and other geographic identifiers, such as zip code and municipality,
to valid addresses. Not all addresses can be geocoded. The main reason addresses do not
geocode is that the address range does not exist. In these cases, the address cannot be
assigned to a specific tract or neighborhood; therefore, we put them in the UNKNOWN category.
In order to assign the Statistical Planning Area (SPA), or neighborhood, to the census tracts in
Cleveland, we have a correspondence file that contains all of the census tracts and the
neighborhood associated with each census tract. Each neighborhood in the City of Cleveland
and each suburban municipality consist of a number of census tracts. The number of census
tracts in each neighborhood/municipality varies depending on population size. For a list of the
census tracts in each neighborhood click here.
The 1990 data in NEO CANDO have been put into the 2000 census tract boundaries to
allow for comparisons between the 1990 and 2000 Censuses. Some census tract
boundaries and numbers change from Census year to Census year. In order to
accurately compare the data over time, the data must be in the same geographic
boundaries. For those census tracts that changed between the 2 Census years, we used
GIS techniques to determine the proportion of the 1990 tract population that lived in the
corresponding 2000 tract.
Geographic reference maps
The Center has created geographic reference maps showing the cities, townships and villages
within each of the 17 counties included in NEO CANDO. Within Cuyahoga County we also have
maps for each of the 36 statistical planning areas in the City of Cleveland. The maps also include
the census tracts that are within or cross the neighborhoods, cities, townships or villages. To
view these geographic reference maps click here.