Confusion about KM Plot. When we get the Graph step line Going Downward and Upwards

[SASuserlot]

Hi , I am newly learning about Kaplan Meier Plot.  I always having the confusion about What kind of Graph I need to Generate. Is my line in the Graph is need to upwards or downwards. Can someone please ans me with example or provide the links about  better understanding about it. I am aware of lifetest program, CNSR etc. But I always confuse when I see the dataset and ask for creating a KM graph. I am providing example dataset, If possible please let me know with this example.

Following dataset is a time to adverse event dataset ( I just created dummy , Please feel free to change if these numbers did not work). in which

TRT- Treatment  ( 1,2)

Aeterm- Adverse event that happened

AVAL= No of days it took to get the Adverse Event from the Start of the Treatment.

I want to create the KM graph that indicates the time (no of days ) to the adverse event.

x axis -No of days

Y axis- probability. of whatever gives upward graph and downward graph

My question is how I Know the graph asked  have the line going downwards or upwards,  in my case whats the probability indicates on Y- axis if line going upwards and whats the probability indicates when it going downwards.

If possible please explain graphs that can be created in both direction. I greatly appreciate all your inputs. Thanks in advance. Is there a simple way to remember? example of the graph.

 data adtte;
 input trt subjid $4. aeterm $9. aval cnsr ;
 datalines;
 1 101A Headache  4  0
 1 102A Headache  12 0
 1 103A Headache  21 0
 1 104A Headache  1  1
 1 105A Headache  1  1
 2 101A Headache  1  1
 2 102A Headache  34 0
 2 103A Headache  21 0
 2 104A Headache  48 0
 2 105A Headache  1  1
 ;
 run;

 example: graph line upwards (in case if you don't understand what I mean above)

Example: Graph line going downwards

[Reeza]

I'm guessing you have different axis labels there - specifically survival versus failure plots. 

Failure is 1-survival or vice versa.

Event probability is likely a failure plot, what percent has failed at time. 

Your second graph is likely a survival plot, what percent remains at a specific time. 

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@SASuserlot wrote:

Hi , I am newly learning about Kaplan Meier Plot.  I always having the confusion about What kind of Graph I need to Generate. Is my line in the Graph is need to upwards or downwards. Can someone please ans me with example or provide the links about  better understanding about it. I am aware of lifetest program, CNSR etc. But I always confuse when I see the dataset and ask for creating a KM graph. I am providing example dataset, If possible please let me know with this example.

Following dataset is a time to adverse event dataset ( I just created dummy , Please feel free to change if these numbers did not work). in which

TRT- Treatment  ( 1,2)

Aeterm- Adverse event that happened

AVAL= No of days it took to get the Adverse Event from the Start of the Treatment.

I want to create the KM graph that indicates the time (no of days ) to the adverse event.

x axis -No of days

Y axis- probability. of whatever gives upward graph and downward graph

My question is how I Know the graph asked  have the line going downwards or upwards,  in my case whats the probability indicates on Y- axis if line going upwards and whats the probability indicates when it going downwards.

If possible please explain graphs that can be created in both direction. I greatly appreciate all your inputs. Thanks in advance. Is there a simple way to remember? example of the graph.

 data adtte;
 input trt subjid $4. aeterm $9. aval cnsr ;
 datalines;
 1 101A Headache  4  0
 1 102A Headache  12 0
 1 103A Headache  21 0
 1 104A Headache  1  1
 1 105A Headache  1  1
 2 101A Headache  1  1
 2 102A Headache  34 0
 2 103A Headache  21 0
 2 104A Headache  48 0
 2 105A Headache  1  1
 ;
 run;

 example: graph line upwards (in case if you don't understand what I mean above)

Example: Graph line going downwards

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