[R] Parameters of Logistic Distribution and (3 Parameter) Log Logistic Distribution

[David Winsemius]

On Jul 31, 2009, at 3:33 AM, Madhavi Bhave wrote:

> Dear R Helpers
>
> Please guide me how one can estimate the parameters of Logistic  
> Distribution and 3 Parameter Log-logistic distribution for a given  
> data.
>
> data <-
>
> c(2987.43,2990.12,3023.52,2964.79,3019.60,3051.07,3080.16,2944.15,3035.19,3023.46,2985.05,2970.95,3192.36,3084.39,2926.23,2952.15,3064.15,3003.20,2980..35,2980.45,3043.12,3115.53,3006.90,2946.03,3039.97,3064.01,3000.56,3049.57,3042.54,3037.63,2982.03,2889.74,3043.83,2930.95,3020.65,3009.21,3084.16,2954.05,2991.04,3083.10,3007.26,2949.58,2995.65,3078.36,3031.64,3001.28,3103.32,3015.04,2994.45,2963.71,2932.90,3021.31,3074.72,2980.15,3002.29,3088.18,2991.39,2942.90,3057.91,3023.25,3192.67,2966.49,3049.31,2915.38,3045.27,2852.72,2999.25,2978.52,3040.07,2945.50,3047.47,2915.95,3012.24,2985.80,2971.04,3035.72,3025.40,3014.76,2979.62,3029.20,2938.38,2966.47,3017.81,3016.43,2989.60,2941.22,3038.30,3033.44,3003.77,2950.02,3053.19,3011.69,2916.34,2918..10,3049.98,3062.46,2948.55,3072.90,3113.52,2987.61)
>

require(MASS)
?fitdistr
>

David Winsemius, MD
Heritage Laboratories
West Hartford, CT