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| The LIFETEST Procedure |
| Displayed Output |
If you use the NOPRINT option in the PROC LIFETEST statement, the procedure does not display any output.
Product-Limit Survival Estimates
The "Product-Limit Survival Estimates" table is displayed if you request the product-limit method of estimation. The table displays the observed (event or censored) time, the estimate of the survivor function, the estimate of the cumulative distribution function of the failure time, the standard error estimate of the estimated survivor function, the Nelson-Aalen cumulative hazard function estimate and its standard error (if the NELSON option is specified in the PROC LIFETEST statement), the number of event times that have been observed, and the number of event or censored times that remain to be observed. The table also includes the frequency of the observed event or censored times if you specify the FREQ statement, and the values of the ID variables if you specify the ID statement. For ODS purposes, the name of this table is "ProductLimitEstimates."
Quartile Estimates
The "Quartiles Estimates" table is displayed if you request the product-limit method of estimation. The table displays the point estimates of the quartiles of the survival times, and the lower and upper confidence limits for the quartiles. For ODS purposes, the name of this table is "Quartiles."
Mean Estimate
The "Mean Estimate" table is displayed if you request the product-limit method of estimation. The table displays the estimated mean survival time and its estimated standard error. For ODS purposes, the name of this table is "Means."
Life-Table Survival Estimates
The "Life-Table Survival Estimates" table is displayed if you request the life-table method of estimation. The table displays the time intervals into which the failure and censored times are distributed (each interval is from the lower limit, up to but not including the upper limit; if the upper limit is infinity, the missing value is printed), the number of events that occur in the interval, the number of censored observations that fall into the interval, the effective sample size for the interval, the estimate of conditional probability of events (failures) in the interval, the standard error of the estimated conditional probability of events, the estimate of the survival function at the beginning of the interval, the estimate of the cumulative distribution function of the failure time at the beginning of the interval, the standard error estimate of the estimated survival function, the estimate of the median residual lifetime (which is the amount of time elapsed before reducing the number of at-risk units to one-half; this is also known as the median future lifetime in Elandt-Johnson and Johnson (1980)), the estimated standard error of the estimated median residual lifetime, the density function estimated at the midpoint of the interval, the standard error estimate of the estimated density, the hazard rate estimated at the midpoint of the interval, and the standard error estimate of the estimated hazard. For ODS purposes, the name of this table is "LifetableEstimates."
Summary of the Number of Censored and Uncensored Values
The "Summary of the Number of Censored and Uncensored Values" table displays the stratum identification if the STRATA statement is specified, the total number of observations, the number of event observations, the number of censored observations, and the percentage of censored observations. For ODS purposes, the name of this table is "CensoredSummary."
Rank Statistics
The "Rank Statistics" table contains the test statistics of the nonparametric k-sample tests. For ODS purposes, the name of this table is "HomStats."
Covariance Matrix for the Log-Rank Statistics
The "Covariance Matrix for the Log-Rank Statistics" table is displayed if the log-rank k-sample test is requested. For ODS purposes, the name of this table is "LogrankHomCov."
Covariance Matrix for the Wilcoxon Statistics
The "Covariance Matrix for the Wilcoxon Statistics" table is displayed if the Wilcoxon k-sample test is requested. For ODS purposes, the name of this table is "WilHomCov."
Covariance Matrix for the Tarone Statistics
The "Covariance Matrix for the Tarone Statistics" table is displayed if the Tarone-Ware k-sample test is requested. For ODS purposes, the name of this table is "TaroneHomCov."
Covariance Matrix for the Peto Statistics
The "Covariance Matrix for the Peto Statistics" table is displayed if the Peto-Peto k-sample test is requested. For ODS purposes, the name of this table is "PetoHomCov."
Covariance Matrix for the ModPeto Statistics
The "Covariance Matrix for the ModPeto Statistics" table is displayed if the modified Peto-Peto k-sample test is requested. For ODS purposes, the name of this table is "ModPetoHomCov."
Covariance Matrix for the Fleming Statistics
The "Covariance Matrix for the Fleming Statistics" table is displayed if the Fleming-Harrington k-sample test is requested. For ODS purposes, the name of this table is "FlemingHomCov."
Test of Equality over Strata
The "Test of Equality over Strata" table is displayed if an unstratified k-sample test is carried out. The table contains the chi-square statistics, degrees of freedom, and p-values of the nonparametric tests and the likelihood ratio test (that is based on the exponential distribution). For ODS purposes, the name of this table is "HomTests."
Stratified Test of Equality over Group
The "Stratified Test of Equality over Group" table is displayed if a stratified test is carried out. The tables contains the chi-square statistics, degrees of freedom, and p-values of the stratified tests. For ODS purposes, the name of this table is "HomTests."
Scores for Trend Test
The "Scores for Trend Test" table is displayed if the TREND option is specified in the STRATA statement. The table contains the set of scores used to construct the trend tests. For ODS purposes, the name of this table is "TrendScores."
Trend Tests
The "Trend Tests" table is displayed if the TREND option is specified in the STRATA statement. The table contains the results of the trend tests. For ODS purposes, the name of this table is "TrendTests."
Adjustment for Multiple Comparisons for the Log-Rank Test
The "Adjustment for Multiple Comparisons for the Log-Rank Test" table is displayed if the log-rank test and a multiple-comparison adjustment method are specified. The table contains the chi-square statistics and the raw and adjusted p-values of the paired comparisons. For ODS purposes, the name of this table is "SurvDiff."
Adjustment for Multiple Comparisons for the Wilcoxon Test
The "Adjustment for Multiple Comparisons for the Wilcoxon Test" table is displayed if the Wilcoxon test and a multiple-comparison method are specified. The table contains the chi-square statistics and the raw and adjusted p-values of the paired comparisons. For ODS purposes, the name of this table is "SurvDiff."
Adjustment for Multiple Comparisons for the Tarone Test
The "Adjustment for Multiple Comparisons for the Tarone Test" table is displayed if the Tarone-Ware test and a multiple-comparison method are specified. The table contains the chi-square statistics and the raw and adjusted p-values of the paired comparisons. For ODS purposes, the name of this table is "SurvDiff."
Adjustment for Multiple Comparisons for the Peto Test
The "Adjustment for Multiple Comparisons for the Peto Test" table is displayed if the Peto-Peto test and a multiple-comparison method are specified. The table contains the chi-square statistics and the raw and adjusted p-values of the paired comparisons. For ODS purposes, the name of this table is "SurvDiff."
Adjustment for Multiple Comparisons for the ModPeto Test
The "Adjustment for Multiple Comparisons for the ModPeto Test" table is displayed if the modified Peto-Peto test and a multiple-comparison method are specified. The table contains the chi-square statistics and the raw and adjusted p-values of the paired comparisons. For ODS purposes, the name of this table is "SurvDiff."
Adjustment for Multiple Comparisons for the Fleming Test
The "Adjustment for Multiple Comparisons for the Fleming Test" table is displayed if the Fleming-Harrington test and a multiple-comparison method are specified. The table contains the chi-square statistics and the raw and adjusted p-values of the paired comparisons. For ODS purposes, the name of this table is "SurvDiff."
Univariate Chi-Squares for the Log-Rank Test
The "Univariate Chi-Squares for the Log-Rank Test" table is displayed if the TEST statement is specified. The table displays the log-rank test results for individual variables in the TEST statement. For ODS purposes, the name of this table is "LogUniChiSq."
Covariance Matrix of the Log-Rank Statistics
The "Covariance Matrix of the Log-Rank Statistics" table is displayed if the TEST statement is specified. The table displays the estimated covariance matrix of the log-rank statistics for association. For ODS purposes, the name of this table is "LogTestCov."
Forward Stepwise Sequence of Chi-Squares for the Log-Rank Test
The "Forward Stepwise Sequence of Chi-Squares for the Log-Rank Test" table is displayed if the TEST statement is specified. The table contains the sequence of partial chi-square statistics for the log-rank test in the order of the greatest increase to the overall test statistic, the degrees of freedom of the partial chi-square statistics, the approximate probability values of the partial chi-square statistics, the chi-square increments for including the given variables, and the probability values of the chi-square increments. For ODS purposes, the name of this table is "LogForStepSeq."
Univariate Chi-Squares for the Wilcoxon Test
The "Univariate Chi-Squares for the Wilcoxon Test" table displays the Wilcoxon test results for individual variables in the TEST statement. For ODS purposes, the name of this table is "WilUniChiSq."
Covariance Matrix of the Wilcoxon Statistics
The "Covariance Matrix of the Wilcoxon Statistics" table is displayed if the TEST statement is specified. The table displays the estimated covariance matrix of the Wilcoxon statistics for association. For ODS purposes, the name of this table is "WilTestCov."
Forward Stepwise Sequence of Chi-Squares for the Wilcoxon Test
The "Forward Stepwise Sequence of Chi-Squares for the Wilcoxon Test" table is displayed if the TEST statement is specified. The table contains the sequence of partial chi-square statistics for the Wilcoxon test in the order of the greatest increase to the overall test statistic, the degrees of freedom of the partial chi-square statistics, the approximate probability values of the partial chi-square statistics, the chi-square increments for including the given variables, and the probability values of the chi-square increments. For ODS purposes, the name of this table is "WilForStepSeq."
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