CP451-10 YOKOGAWA Yokogawa controller
Technical data of product parameters
but they have not proved satisfactory in isolating the effects of individual geometric or traffic control
features”. In other words, even if the coefficients from the SPFs are not reliable enough to develop
CMFs, the predictions from the CP451-10 YOKOGAWA are considered reliable enough to be used as part of a before-afterCP451-10 YOKOGAWA
comparison group or empirical Bayes study. The comparison group method does not explicitly account
for RTM. Hence, it is a viable approach if sites are not selected based on crash history (e.g., blanket
installation of a treatment) or a long before period is available reducing the possible bias due to RTM.
Chapter 9 of Hauer (1997) has a detailed discussion of sample size considerations for a before-after
study with a comparison group, including the equations to be used in the calculations.
Empirical-Bayes before-after study
The empirical Bayes CP451-10 YOKOGAWA method is outlined in Hauer (1997). The EB method has been shown to be able
to address the possible bias due to RTM, account for changes in traffic volume, and account for
temporal effects. As with all before-after designs, the intent of the EB procedure is to estimate the
expected number of crashes that would have occurred had there been no treatment and compare thatCP451-10 YOKOGAWA
with the number of reported crashes after the treatment was implemented. The EB procedure leads to
a much more accurate estimate of the expected number without treatment.
The following steps are used to estimate the expected number of crashes that would have occurred had
there been no treatment:
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