Description Usage Arguments Details Value Examples
This function tests linearity below a specified dose.
1 |
dosecolumn |
Name of dose column in input dataframe. |
targetcolumn |
Name of response column in input dataframe. |
cutoffdose |
Cut-off dose (numeric). |
data |
Input dataframe. |
The user may provide a limit below which the linearity of the dose-response relationship is tested. A significant result indicates that the slope is non-zero below the user-specified cutoff dose.
The nlaad, nlbcd, and lbcd functions are currently only intended for use on continuous outcome data.
A summary table showing the intercept and slope coefficients for the linear function below the user-specified dose, along with standard errors and significance tests.
1 2 3 4 5 6 7 8 9 10 | # Conducts a linear regression for all doses below 1.5
# (i.e., all dose levels up to and including 1.4929).
# The significance test on the dose coefficient is the test of non-zero linear slope:
lbcd("dose", "MF_Log", cutoffdose=1.5, data=DRdata)
# This produces an error, as no cutoffdose was specified:
## Not run:
lbcd("dose", "MF_Log", data=DRdata)
## End(Not run)
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