To estimate percentiles and survival probabilities
main topic see also
You can estimate percentiles and survival probabilities for new predictor
values, or the values in your data.
1 In the Regression with Life
Data dialog box, click Estimate.
2 Do one of the following:
· To
enter new predictor values: In Enter new predictor values, enter a set
of predictor values (or columns containing sets of predictor values) for
which you want to estimate percentiles or survival probabilities. The
predictor values must be in the same order as the main effects in the
model. For an illustration, see Example
of regression with life data.
· To
use the predictor values in the data, choose Use predictor values in data (storage only).
Because of the potentially large amount of output, Minitab stores the
results in the worksheet rather then printing them in the Session window.
3 Do any of the following, then
click OK:
· To
estimate percentiles, enter the percents or a column of percents in Estimate percentiles
for percents. By default, Minitab estimates the 50th percentile.
If you want to look at the beginning, middle, and end of the product's
lifetime for a given predictor value, enter 10 50 90 (the 10th, 50th,
90th percentiles). Minitab then estimates how long it takes for 10% of
the units to fail, 50% of the units to fail, and 90% of the units to fail.
· To
estimate survival probabilities, enter the times or a column of times
in Estimate probabilities
for times. For example, when you enter 70 (units in hours
in this example), Minitab estimates the probability, for each predictor
value, that the unit will survive past 70 hours.