001package org.hl7.fhir.r4.model.codesystems; 002 003/* 004 Copyright (c) 2011+, HL7, Inc. 005 All rights reserved. 006 007 Redistribution and use in source and binary forms, with or without modification, 008 are permitted provided that the following conditions are met: 009 010 * Redistributions of source code must retain the above copyright notice, this 011 list of conditions and the following disclaimer. 012 * Redistributions in binary form must reproduce the above copyright notice, 013 this list of conditions and the following disclaimer in the documentation 014 and/or other materials provided with the distribution. 015 * Neither the name of HL7 nor the names of its contributors may be used to 016 endorse or promote products derived from this software without specific 017 prior written permission. 018 019 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 020 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 021 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 022 IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 023 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 024 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 025 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 026 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 027 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 028 POSSIBILITY OF SUCH DAMAGE. 029 030*/ 031 032// Generated on Thu, Sep 13, 2018 09:04-0400 for FHIR v3.5.0 033 034 035import org.hl7.fhir.exceptions.FHIRException; 036 037public enum V3ProbabilityDistributionType { 038 039 /** 040 * The beta-distribution is used for data that is bounded on both sides and may or may not be skewed (e.g., occurs when probabilities are estimated.) Two parameters a and b are available to adjust the curve. The mean m and variance s2 relate as follows: m = a/ (a + b) and s2 = ab/((a + b)2 (a + b + 1)). 041 */ 042 B, 043 /** 044 * Used for data that describes extinction. The exponential distribution is a special form of g-distribution where a = 1, hence, the relationship to mean m and variance s2 are m = b and s2 = b2. 045 */ 046 E, 047 /** 048 * Used to describe the quotient of two c2 random variables. The F-distribution has two parameters n1 and n2, which are the numbers of degrees of freedom of the numerator and denominator variable respectively. The relationship to mean m and variance s2 are: m = n2 / (n2 - 2) and s2 = (2 n2 (n2 + n1 - 2)) / (n1 (n2 - 2)2 (n2 - 4)). 049 */ 050 F, 051 /** 052 * The gamma-distribution used for data that is skewed and bounded to the right, i.e. where the maximum of the distribution curve is located near the origin. The g-distribution has a two parameters a and b. The relationship to mean m and variance s2 is m = a b and s2 = a b2. 053 */ 054 G, 055 /** 056 * The logarithmic normal distribution is used to transform skewed random variable X into a normally distributed random variable U = log X. The log-normal distribution can be specified with the properties mean m and standard deviation s. Note however that mean m and standard deviation s are the parameters of the raw value distribution, not the transformed parameters of the lognormal distribution that are conventionally referred to by the same letters. Those log-normal parameters mlog and slog relate to the mean m and standard deviation s of the data value through slog2 = log (s2/m2 + 1) and mlog = log m - slog2/2. 057 */ 058 LN, 059 /** 060 * This is the well-known bell-shaped normal distribution. Because of the central limit theorem, the normal distribution is the distribution of choice for an unbounded random variable that is an outcome of a combination of many stochastic processes. Even for values bounded on a single side (i.e. greater than 0) the normal distribution may be accurate enough if the mean is "far away" from the bound of the scale measured in terms of standard deviations. 061 */ 062 N, 063 /** 064 * Used to describe the quotient of a normal random variable and the square root of a c2 random variable. The t-distribution has one parameter n, the number of degrees of freedom. The relationship to mean m and variance s2 are: m = 0 and s2 = n / (n - 2) 065 */ 066 T, 067 /** 068 * The uniform distribution assigns a constant probability over the entire interval of possible outcomes, while all outcomes outside this interval are assumed to have zero probability. The width of this interval is 2s sqrt(3). Thus, the uniform distribution assigns the probability densities f(x) = sqrt(2 s sqrt(3)) to values m - s sqrt(3) >= x <= m + s sqrt(3) and f(x) = 0 otherwise. 069 */ 070 U, 071 /** 072 * Used to describe the sum of squares of random variables which occurs when a variance is estimated (rather than presumed) from the sample. The only parameter of the c2-distribution is n, so called the number of degrees of freedom (which is the number of independent parts in the sum). The c2-distribution is a special type of g-distribution with parameter a = n /2 and b = 2. Hence, m = n and s2 = 2 n. 073 */ 074 X2, 075 /** 076 * added to help the parsers 077 */ 078 NULL; 079 public static V3ProbabilityDistributionType fromCode(String codeString) throws FHIRException { 080 if (codeString == null || "".equals(codeString)) 081 return null; 082 if ("B".equals(codeString)) 083 return B; 084 if ("E".equals(codeString)) 085 return E; 086 if ("F".equals(codeString)) 087 return F; 088 if ("G".equals(codeString)) 089 return G; 090 if ("LN".equals(codeString)) 091 return LN; 092 if ("N".equals(codeString)) 093 return N; 094 if ("T".equals(codeString)) 095 return T; 096 if ("U".equals(codeString)) 097 return U; 098 if ("X2".equals(codeString)) 099 return X2; 100 throw new FHIRException("Unknown V3ProbabilityDistributionType code '"+codeString+"'"); 101 } 102 public String toCode() { 103 switch (this) { 104 case B: return "B"; 105 case E: return "E"; 106 case F: return "F"; 107 case G: return "G"; 108 case LN: return "LN"; 109 case N: return "N"; 110 case T: return "T"; 111 case U: return "U"; 112 case X2: return "X2"; 113 default: return "?"; 114 } 115 } 116 public String getSystem() { 117 return "http://terminology.hl7.org/CodeSystem/v3-ProbabilityDistributionType"; 118 } 119 public String getDefinition() { 120 switch (this) { 121 case B: return "The beta-distribution is used for data that is bounded on both sides and may or may not be skewed (e.g., occurs when probabilities are estimated.) Two parameters a and b are available to adjust the curve. The mean m and variance s2 relate as follows: m = a/ (a + b) and s2 = ab/((a + b)2 (a + b + 1))."; 122 case E: return "Used for data that describes extinction. The exponential distribution is a special form of g-distribution where a = 1, hence, the relationship to mean m and variance s2 are m = b and s2 = b2."; 123 case F: return "Used to describe the quotient of two c2 random variables. The F-distribution has two parameters n1 and n2, which are the numbers of degrees of freedom of the numerator and denominator variable respectively. The relationship to mean m and variance s2 are: m = n2 / (n2 - 2) and s2 = (2 n2 (n2 + n1 - 2)) / (n1 (n2 - 2)2 (n2 - 4))."; 124 case G: return "The gamma-distribution used for data that is skewed and bounded to the right, i.e. where the maximum of the distribution curve is located near the origin. The g-distribution has a two parameters a and b. The relationship to mean m and variance s2 is m = a b and s2 = a b2."; 125 case LN: return "The logarithmic normal distribution is used to transform skewed random variable X into a normally distributed random variable U = log X. The log-normal distribution can be specified with the properties mean m and standard deviation s. Note however that mean m and standard deviation s are the parameters of the raw value distribution, not the transformed parameters of the lognormal distribution that are conventionally referred to by the same letters. Those log-normal parameters mlog and slog relate to the mean m and standard deviation s of the data value through slog2 = log (s2/m2 + 1) and mlog = log m - slog2/2."; 126 case N: return "This is the well-known bell-shaped normal distribution. Because of the central limit theorem, the normal distribution is the distribution of choice for an unbounded random variable that is an outcome of a combination of many stochastic processes. Even for values bounded on a single side (i.e. greater than 0) the normal distribution may be accurate enough if the mean is \"far away\" from the bound of the scale measured in terms of standard deviations."; 127 case T: return "Used to describe the quotient of a normal random variable and the square root of a c2 random variable. The t-distribution has one parameter n, the number of degrees of freedom. The relationship to mean m and variance s2 are: m = 0 and s2 = n / (n - 2)"; 128 case U: return "The uniform distribution assigns a constant probability over the entire interval of possible outcomes, while all outcomes outside this interval are assumed to have zero probability. The width of this interval is 2s sqrt(3). Thus, the uniform distribution assigns the probability densities f(x) = sqrt(2 s sqrt(3)) to values m - s sqrt(3) >= x <= m + s sqrt(3) and f(x) = 0 otherwise."; 129 case X2: return "Used to describe the sum of squares of random variables which occurs when a variance is estimated (rather than presumed) from the sample. The only parameter of the c2-distribution is n, so called the number of degrees of freedom (which is the number of independent parts in the sum). The c2-distribution is a special type of g-distribution with parameter a = n /2 and b = 2. Hence, m = n and s2 = 2 n."; 130 default: return "?"; 131 } 132 } 133 public String getDisplay() { 134 switch (this) { 135 case B: return "beta"; 136 case E: return "exponential"; 137 case F: return "F"; 138 case G: return "(gamma)"; 139 case LN: return "log-normal"; 140 case N: return "normal (Gaussian)"; 141 case T: return "T"; 142 case U: return "uniform"; 143 case X2: return "chi square"; 144 default: return "?"; 145 } 146 } 147 148 149} 150