Dear Team,
I failled to have quantitative measure of goodness of fit for Cox regression model. I used estat concordance but the following message is displayed: estat concordance may not be used with late entry or time-varying data. I checked for time-varying using stvary and there is no time-varying variable. The work is about academic persistence to grade 4 and only freshmen are considered in the database so I might not have late entry because analysis time is the time from entry to the date of achieving grade 4.
I used Cox-Snell residual graph but need quantitative measure.
Any idea?
Thanks
I failled to have quantitative measure of goodness of fit for Cox regression model. I used estat concordance but the following message is displayed: estat concordance may not be used with late entry or time-varying data. I checked for time-varying using stvary and there is no time-varying variable. The work is about academic persistence to grade 4 and only freshmen are considered in the database so I might not have late entry because analysis time is the time from entry to the date of achieving grade 4.
I used Cox-Snell residual graph but need quantitative measure.
Any idea?
Thanks
