Update README.md

Author: ehsanx

README.md

@@ -25,14 +25,18 @@ setwd("C:/data") # change working dir
 
 ## Using simmsm command to generate data in the wording directory
 ```R
-simmsm(subjects = 2500, tpoints = 10, psi = 0.3, n = 5)
+simmsm(subjects = 2500, tpoints = 10, psi = 0.3, n = 1000)
+# 1000 datasets
+# 2500 subjects in each datasets
+# Each subject followed upto 10 time-points (say, months)
+# Causal effect (log-odds) is 0.3
 ```
 |    **Parameter**    | **Description** |
 |----------------|------------|
-| *subjects*  | Number of Subjects in each simulated dataset: |
-| *tpoints*      | Maximum number of time-points each subjects are followed:   |
-| *psi* | Causal effect parameter for Marginal Structural Model:  |
-| *n* | Number of simulated datasets an user wants to generate:  |
+| *subjects*  | Number of Subjects in each simulated dataset |
+| *tpoints*      | Maximum number of time-points each subjects are followed   |
+| *psi* | Causal effect parameter for Marginal Structural Model  |
+| *n* | Number of simulated datasets an user wants to generate  |
 
 ### Author 
 * Ehsan Karim :octocat: (R porting from SAS)