What is sts in stata?
sts test tests the equality of the survivor function across groups. sts generate creates new variables containing the estimated survivor function, the Nelson–Aalen cumulative hazard function, and other related functions.
What does data not st mean in Stata?
st is verifies that the data in memory are survival-time (st) data. If not, it issues the error message “data not st”, r(119). st is currently “release 2”, meaning that this is the second design of the system. Programs written for the previous release continue to work.
What is STS list?
Description. sts list lists the estimated survivor, failure, or the Nelson–Aalen estimated cumulative (integrated) hazard function. See [ST] sts for an introduction to this command. sts list can be used with single- or multiple-record or single- or multiple-failure st data.
How do you interpret a hazard ratio for a continuous variable?
With a continuous variable, the hazard ratio indicates the change in the risk of death if the parameter in question rises by one unit, for example if the patient is one year older on diagnosis. For every additional year of patient age on diagnosis, the risk of death falls by 7% (hazard ratio 0.93).
How do you interpret a survival curve?
The lines represent survival curves of the two groups. A vertical drop in the curves indicates an event. The vertical tick mark on the curves means that a patient was censored at this time. At time zero, the survival probability is 1.0 (or 100% of the participants are alive).
What does a survival curve tell you?
The visual representation of this function is usually called the Kaplan-Meier curve, and it shows what the probability of an event (for example, survival) is at a certain time interval. If the sample size is large enough, the curve should approach the true survival function for the population under investigation.
What does a survival curve show?
Are odds ratio and hazard ratio the same?
Hazard ratios differ from relative risks (RRs) and odds ratios (ORs) in that RRs and ORs are cumulative over an entire study, using a defined endpoint, while HRs represent instantaneous risk over the study time period, or some subset thereof.
How do you analyze a survival plot?
Survival analysis is used in several ways:
- To describe the survival times of members of a group. Life tables. Kaplan–Meier curves.
- To compare the survival times of two or more groups. Log-rank test.
- To describe the effect of categorical or quantitative variables on survival. Cox proportional hazards regression.
How do you read hazard ratio graphs?
If the hazard ratio is > 1, it indicates that the treatment group has a shorter survival than the control referenced group, and if it is < 1, it indicates that the group of interest is less likely to have a shorter time to the event than the reference group. The ratio does not quantify the magnitude of the difference.
How do you analyze a survival curve?
How to make the best graphs in Stata?
Symmetry plots
How to create and modify histograms in Stata?
Setting Up. If you plan to carry out the examples in this article,make sure you’ve downloaded the GSS sample to your U:\\SFS folder as described in Managing Stata Files.
How to plot in Stata?
Fit Lines. Stata can plot several different kinds of fit lines automatically.
How do you create a graph?
Click Insert > Chart.