Update header mappings

DESCRIPTION

@@ -1,7 +1,7 @@
 Package: MungeSumstats
 Type: Package
 Title: Standardise summary statistics from GWAS
-Version: 1.9.17
+Version: 1.9.18
 Authors@R:
     c(person(given = "Alan",
            family = "Murphy",

NEWS.md

@@ -1,3 +1,35 @@
+## CHANGES IN VERSION 1.9.18
+
+### New column header mappings
+* "VARIANT_ID" and "RSIDS" --> "SNP"
+* "P_BOLT_LMM" --> "P"
+* "NCASES" --> "N_CAS"
+* "N_EFFECTIVE", "N_INFORMATIVE", and "TOTAL_N" --> "N"
+* "HET_P" --> "HETPVAL"
+* "HET_ISQ" --> "HETISQT"
+* "ALL_AF" --> "FRQ"
+* "DIRECT" --> "DIRECTION"
+* "ALT_EFFSIZE" --> "BETA"
+* "INFORMATIVE_ALT_AC" --> "AC"
+
+### Fixed column header mappings
+* Made all uncorrected header names uppercase and removed duplicates
+* "TOTALSAMPLESIZE" now maps to "N" instead of "NSTUDY"
+* "MAJORALLELE", "MAJOR_ALLELE", "MAJOR-ALLELE", and "MAJOR ALLELE" now map to 
+"A1" instead of "A2"
+* Removed the mappings for "OR-A1", "OR.A1", "OR_A1", and "BETA1" because MSS 
+assumes that A2 is the effect allele
+* Removed mappings for "A1FREQ", "A1FRQ", "AF1", "FREQ.A1.1000G.EUR", 
+"FREQ.A1.ESP.EUR", "FREQ.ALLELE1.HAPMAPCEU", "FREQ1", "FREQ1.HAPMAP", and 
+"FRQ_A1" because MSS defines "FRQ" to be the allele frequency of A2
+* Removed mappings for "CHR36", "BASE_GRCH36", "POSITION36", "POSGRCH36", 
+"BASEGRCH36", "POS36", "POS GRCH36", "POS.GRCH36", "POS-GRCH36", and "POS_GRCH36" 
+because MSS does not support the GRCh36 genome build
+* Removed the ambiguous mapping "NMISS" -> "N" because "NMISS" can refer to the 
+number of samples with missing data
+* Removed the ambiguous mapping "WEIGHT" -> "N" because "WEIGHT" can refer to 
+coefficient weights
+
 ## CHANGES IN VERSION 1.9.17
 
 ### Bug fix