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Dear Fs support,
If I have the following FSGD with 4 classes and 3 variables, and I'd like
to run an interaction of ROIa x ROIb controlling for the third covariate
(eTIV), would I use the following contrast?
[0 0 0 0 0.25 -0.25 -0.25 0.25 0.25 -0.25 -0.25 0.25 0 0 0 0]
For the interaction of ROIa x ROIb x class + eTIV.
Thank you so much in advance for your help!
All the best,
Fred
GroupDescriptorFile 1
Title nameoffsgdfile.fsgd
Measurement volume
Class A_F
Class A_M
Class B_F
Class B_M
Variables ROIa ROIb eTIV
Input sub1 A_F 2146 20.33625633 1504145.407
Input sub2 A_M 1939.5 31.8504755 1593187.64
Input sub3 A_F 2151 22.07149083 1657401.5
Input sub4 A_M 2434.5 22.05750017 1311695.512
Input sub5 A_M 2001.5 22.55658633 1755645.299
Input sub6 A_F 1801.5 26.5350915 1779925.617
Input sub7 B_M 2162 30.39876617 1716842.144
Input sub8 B_M 2168.5 34.73297133 1526340.663
Input sub9 B_F 2264.5 25.0136425 1556398.768
Input sub10 B_F 2174.5 22.71414967 1446025.924
Input sub11 B_M 2034.5 29.949359 1515728.033
Input sub12 B_M 2432 29.622818 1489855.126
Input sub13 A_M 2096.5 25.8486635 1347191.825
Input sub14 A_M 1858.5 28.2977635 1382589.799
Input sub15 A_F 2068.5 30.63248333 1316420.787
Input sub16 B_M 2307 32.57595733 1495284.962
Input sub17 A_M 2465.5 26.66168167 1384746.859
Input sub18 A_M 2508.5 34.5229105 1225308.85
Input sub19 A_M 2204 33.294218 1569799.864
Input sub20 A_M 1851 23.96655733 1386145.412
Input sub21 A_F 1894.5 35.20543367 1862979.897
Input sub22 A_M 2049 32.34155333 1337636.649
Input sub23 A_M 2153.5 36.6719885 1269390.136
Input sub24 A_F 1986 31.56104067 1303142.032
Input sub25 A_F 1792.5 33.25444367 1476396.754
Input sub26 A_M 2049 32.22782383 1337636.649
Input sub27 A_M 2100.5 28.766784 1435970.791
Input sub28 A_M 1888 22.50610183 1396596.322
Input sub29 A_M 1877 28.858904 1470791.182
Input sub30 A_M 2097 32.89453117 1448722.686
Input sub31 A_M 2020 40.83322383 1579273.827
Input sub32 A_M 1836.5 23.00048933 1700026.868
Input sub33 A_M 2100 41.37518917 1863140.47
Input sub34 A_M 2219.5 32.85125533 2145150.855
Input sub35 A_M 1949 39.57386783 1578642.536
Input sub36 A_M 2319 34.94416917 1479160.432
Input sub37 A_M 1886.5 28.34985783 1605063.946
Input sub38 A_M 1933 42.81283933 1459506.529
Input sub39 A_M 2080.5 49.87224533 1554036.591
Input sub40 A_M 1854 23.64180717 1652834.725
Input sub41 A_M 1935.5 30.9185125 1526781.874
Input sub42 A_M 1762 28.28765967 1586842.657
Input sub43 B_M 2499 35.34234583 1742642.225
Input sub44 B_M 2008.5 33.1685505 1579838.419
Input sub45 B_F 2046 31.59107583 1341242.207
Input sub46 B_M 1976.5 26.07367317 1488348.43
Input sub47 B_F 2444 28.29680833 1130340.33
Input sub48 B_M 1753 38.245595 1663233.473
Input sub49 B_F 2076 43.30021817 1587461.094
Input sub50 B_M 1794 26.2010335 1450295.095
Input sub51 B_M 1922 25.59681217 1715412.84
Input sub52 B_M 2003 35.62484433 1508502.394
Input sub53 B_M 2296 30.38256167 1648703.126
Input sub54 B_F 2240 34.520078 1870050.001
Input sub55 B_M 1944 34.71860117 1666484.562
Input sub56 B_M 1997.5 29.37144183 1507480.309
Input sub57 B_M 2055.5 33.063017 1611706.453
Input sub58 B_F 2023 29.3300005 1223010.644
Input sub59 B_M 1809.5 28.92360767 1468986.639
Input sub60 B_M 1962.5 18.96357633 1535612.928
Input sub61 B_F 1911 19.6928165 1259355.161
Input sub62 B_F 1927 28.77811983 1329314.312
Input sub63 B_M 1934 24.21552633 1391496.252
Input sub64 B_M 1912.5 26.12408383 1378029.623
Input sub65 B_M 1767 28.9703365 1481795.13
Input sub66 A_M 2221.5 31.0197405 1350206.831
Input sub67 A_M 1909.5 29.5709795 1424512.488
Input sub68 A_M 1959.5 26.1728375 2623166.788
Input sub69 A_M 1881 29.06976833 1534386.796
Input sub70 A_M 1824 23.43084617 1516078.453
Input sub71 A_M 1901 30.62695117 1509449.04
Input sub72 A_M 2005 36.9141975 1558358.476
Input sub73 A_F 1807.5 19.80977633 1241937.941
Input sub74 A_F 1535.5 26.79078917 1470569.755
Input sub75 A_F 2112 26.66763717 1189597.023
Input sub76 A_M 1869 23.43077817 1608435.489
Input sub77 B_M 1973 28.85614233 1602618.651
Input sub78 B_M 1955.5 29.11186517 1644179.629
Input sub79 A_F 1789 24.21647467 1444121.555
Input sub80 A_M 1816.5 40.63233183 1476714.143
Input sub81 A_M 1928.5 33.257435 1457006.023
Input sub82 A_M 1871 48.23347067 1950750.298
Input sub83 A_M 1935 33.04654833 1452465.16
Input sub84 A_M 1942 29.47000717 1576379.963
Input sub85 B_M 1977 32.936728 1480433.825
Input sub86 B_F 1792 24.27936417 1477923.577
Input sub87 B_M 1872 35.6097105 1711532.365
Input sub88 B_M 1820.5 32.815366 1296653.79
Input sub89 B_M 1953.5 25.94216617 1396227.256
Input sub90 A_M 1829.5 35.1000415 1438238.404
Input sub91 A_M 1913 23.62259 1487798.562
Input sub92 A_M 2033 27.362109 1422126.27
Input sub93 A_M 2005 26.27670433 1720136.734
Input sub94 A_M 2138.5 40.70883117 1384806.704
Input sub95 A_F 1980.5 34.28147083 1496305.505
Input sub96 A_F 1962 31.018718 1479191.092
Input sub97 A_M 1922 24.67903817 1455298.759
Input sub98 A_M 1804.5 18.21498267 1941506.329
Input sub99 A_M 2077 26.73747583 1493159.499
Input sub100 A_M 1931.5 25.8555435 1296272.102
Input sub101 A_M 2025.5 22.82152833 1294097.863
Input sub102 A_M 1908.5 30.378732 1507587.393
Input sub103 A_M 1912.5 26.92956017 1787790.456
Input sub104 B_M 1925.5 23.95973417 966801.2484
Input sub105 B_M 1921.5 29.473253 1496812.597
Input sub106 B_M 1884 25.64464167 1247265.156
Input sub107 B_M 2229 37.62200683 2166616.473
Input sub108 B_M 2068 33.89553983 1370411.913
Input sub109 B_M 2041.5 23.7677135 1330952.143
Input sub110 B_M 1911.5 31.71652517 1346248.811
Input sub111 B_F 2169 23.2439965 1199153.966
Input sub112 B_F 1980.5 27.14536867 1421175.083
Input sub113 B_M 2133 37.15614717 1524096.637
Input sub114 B_M 2136 27.26808767 1180546.476
Input sub115 B_M 1862 25.321687 1428300.273
Input sub116 B_M 1982.5 30.14781317 1580774.594
Input sub117 B_M 2030.5 26.10099917 1423673.816
Input sub118 B_F 2006 28.9680355 1460984.494
Input sub119 B_M 1928.5 30.7483965 1387604.289
Input sub120 B_F 2096 25.1052415 1180549.972
Input sub121 B_M 2044.5 36.57288533 1421636.109
Input sub122 B_F 2162.5 29.908746 1489552.837
Input sub123 B_M 2053 30.84810967 1422363.183
Input sub124 B_M 2135.5 27.81202783 1456604.473
Input sub125 B_M 2033 26.52565017 1466875.582
Input sub126 B_M 1878 38.33442633 1578424.036
Input sub127 B_F 2071.5 28.50238283 1288842.99
Input sub128 B_F 1909.5 40.94083617 1540277.353
Input sub129 A_M 2030 37.34181283 1899789.882
Input sub130 B_F 1973 31.61594767 1540926.128
Input sub131 B_F 1969.5 27.605303 1808448.811
Input sub132 A_M 1892.5 28.243212 1462086.267
Input sub133 B_M 1857 38.28719717 1712276.052
Input sub134 A_M 2129.5 46.42948033 1605307.546
Input sub135 A_M 1720 28.78069483 1473506.258
Input sub136 B_M 1867.5 40.20891767 1943148.181
Input sub137 A_M 1892.5 33.45218967 1645044.419
Input sub138 A_M 1910 32.36987817 1649137.707
Input sub139 B_M 1922.5 28.6316405 1334082.007
Input sub140 B_F 1964.5 23.43107717 1358701.257
Input sub141 A_M 1902.5 38.77039433 1713563.744
Input sub142 B_M 1894 29.26344983 1486846.943
Input sub143 A_M 1984.5 31.287444 1558283.434
Input sub144 A_M 2113.5 34.3738745 1819888.647
Input sub145 A_M 1784.5 29.878838 1651775.217
Input sub146 B_M 2013 38.223378 1374321.735
Input sub147 A_M 1972.5 29.216181 1657056.306
Input sub148 B_M 1738.5 28.57547167 1255008.706
Input sub149 B_M 2053.5 42.92599967 1627930.69
Input sub150 A_M 2079.5 33.4995515 1432089.054
Input sub151 A_M 2137.5 33.74895783 1630120.488
Input sub152 A_M 1904 31.64655583 1578105.163
Input sub153 A_M 2185 37.06430033 1483178.325
Input sub154 A_M 1972 33.0609555 1649902.105
Input sub155 A_M 2004.5 44.877278 1719321.986
Input sub156 A_M 1874.5 34.982036 1682122.511
Input sub157 B_M 2072 37.69892067 1627297.178
Input sub158 A_M 2135 38.75092267 1528366.287
Input sub159 A_F 1786.5 35.06973533 1275178.243
Input sub160 A_M 2172 33.61697 1512557.87
Input sub161 A_M 1970 35.096838 1556633.305
Input sub162 A_M 1817 25.02674483 1470995.991
Input sub163 B_M 1904 32.55769633 1598963.786
Input sub164 A_M 1814.5 23.43992117 1491433.746
Input sub165 B_M 1968 27.07218517 1379579.177
Input sub166 B_M 1905 27.7189595 1287874.71
Input sub167 A_M 1834 31.92255217 1374752.165
Input sub168 B_M 1976 30.23120833 1670162.383
Input sub169 B_F 1918 26.14171683 1469844.133
Input sub170 A_M 1791 31.15161717 1566833.768
Input sub171 B_M 1864 31.15537583 1280427.589
Input sub172 B_M 2087 23.71959017 1732034.096
Input sub173 A_M 2037.5 27.17748617 1398316.19
Input sub174 A_M 1759 26.97819317 1491721.821
Input sub175 A_M 1993 35.447364 1846102.998
Input sub176 B_M 2055 28.42716517 1641304.814
Input sub177 A_F 2131.5 28.42833467 1261854.092
Input sub178 A_M 1635 27.59790467 1870053.211
Input sub179 A_M 1899.5 24.025162 1624895.033
Input sub180 A_M 1744 33.98616883 1836093.792
Input sub181 A_M 2108 28.04943567 1750956.494
Input sub182 A_M 1861 26.75774967 1523019.962
Input sub183 A_M 1747.5 38.48966233 1862139.463
Input sub184 A_M 1756 33.98419633 1620417.666
Input sub185 A_M 1913 32.76444483 1594284.653
Input sub186 B_F 1859.5 25.54400217 1474949.091
Input sub187 B_F 1819 26.761337 1521916.742
Input sub188 B_M 1731 34.55783967 1637952.134
Input sub189 B_M 1686 18.59182433 1470067.854
Input sub190 A_M 1896.5 25.11352133 1420909.532
Input sub191 B_F 2007 25.61830733 1625554.487
Input sub192 A_M 1722.5 33.0701215 2084994.298
Input sub193 B_M 1534 25.59023567 1685264.391
Input sub194 A_M 1862 26.08810433 1452442.956
Input sub195 A_M 2155 39.16923117 1479722.824
Input sub196 B_M 1839 26.29586233 1656636.856
Input sub197 B_F 1717 26.87686 1494928.771
Input sub198 B_M 1917 25.5925635 1636386.607
Input sub199 A_M 1824 32.5394235 1741175.596
Input sub200 B_M 1852.5 23.43595083 1609853.125
Input sub201 A_F 1877.5 25.49818783 1420302.313
Input sub202 B_M 1725.5 32.14003583 1645052.699
Input sub203 B_F 1846 29.49685717 1424342.514
Input sub204 A_M 1844 36.47620567 1618444.878
Input sub205 B_F 1944 28.870049 1368365.815
Input sub206 B_M 1767.5 33.1543095 1705510.275
Input sub207 A_F 1947 26.30757033 1410941.311
Input sub208 B_M 1860 37.01854417 1706781.567
Input sub209 B_F 1840.5 35.36049017 1418973.236
Input sub210 B_M 1356 25.89827733 1746964.902
Input sub211 A_M 1862 37.07832433 1793881.442
Input sub212 A_M 2328 25.21812467 1472194.35
Input sub213 A_M 2025.5 33.22042383 1829826.991
Input sub214 A_M 2122.5 31.25756167 1450393.822
Input sub215 A_M 2130.5 46.527645 1586850.053
Input sub216 B_M 2020 23.05091467 1799652.509
Input sub217 B_M 1859.5 30.23841367 1629804.93
Input sub218 B_M 1886 22.22611383 1682305.374
Input sub219 B_M 2087.5 32.9504375 1579179.818
Input sub220 B_M 1956 37.626764 1708942.312
Input sub221 B_M 2083.5 39.23070533 1592540.368
Input sub222 B_M 2024 32.18733633 1712467.683
Input sub223 A_M 2340 31.37917867 1655270.79
Input sub224 B_F 2104 33.08156583 1819242.971
Input sub225 A_F 2223 42.966719 1568964.755
Input sub226 A_M 1808.5 37.81531567 2336177.102
Input sub227 A_M 1938.5 36.09957983 1404262.669
Input sub228 A_M 2031.5 40.816767 1832238.014
Input sub229 B_F 2189 37.48573433 1617865.495
Input sub230 B_F 1899.5 35.74276083 1381320.642
Input sub231 A_M 1940.5 31.9374665 1624182.519
Input sub232 A_M 2030 38.91613167 1900610.052
Input sub233 A_M 1904.5 40.3727265 1621455.334
Input sub234 B_M 2162.5 36.128472 1992631.968
Input sub235 B_M 1946 31.6160185 1831335.804
Input sub236 B_M 1852.5 34.61452533 1572947.518
Input sub237 B_F 1943.5 37.018964 1588962.483
Input sub238 A_F 1957.5 28.2658935 1545406.319
Input sub239 B_F 1816.5 29.18688167 1387018.015
Input sub240 B_M 1831 30.178166 1648475.778
Input sub241 B_M 1770.5 30.652627 1615013.571
Input sub242 B_F 1817.5 24.7068445 1481705.92
Input sub243 B_F 1836.5 28.33750883 1518223.307
Input sub244 A_M 1770.5 35.68608767 1424795.164
Input sub245 A_M 2134 29.411903 1396368.869
Input sub246 A_M 2131 23.088457 1220114.316
Input sub247 A_M 2160.5 27.7034415 1353640.462
Input sub248 A_M 1799 39.15961 1645821.602
Input sub249 A_F 1860 38.6857675 1422457.277
Input sub250 A_M 1956 29.09930667 1232201.605
Input sub251 A_M 2158 37.95267133 1654518.16
Input sub252 A_M 1806.5 26.40454683 1410913.293
Input sub253 A_F 2038 34.55823783 1434367.957
Input sub254 A_M 2026.5 33.66492333 1531569.113
Input sub255 A_M 1976 31.42589933 1612181.227
Input sub256 B_M 2121.5 34.45023267 1353542.472
Input sub257 B_M 1850.5 32.70686383 1520900.892
Input sub258 B_M 1792 29.44374667 1536621.225
Input sub259 B_M 1955 26.7285265 1424601.775
Input sub260 B_M 2125.5 31.2571185 1389399.279
Input sub261 B_M 1971 31.37432333 1361246.495
Input sub262 B_M 2118 26.9727555 1464455.289
Input sub263 B_M 2019.5 28.14785833 1274267.241
Input sub264 B_M 1740 24.20796383 1756410.646
Input sub265 B_M 1809.5 34.22383933 1659122.722
Input sub266 B_M 2081 27.24343883 1333699.194
Input sub267 A_M 1811.5 28.1193 2075077.803
Input sub268 B_M 1716.5 20.73768917 1471518.932
Input sub269 A_M 1941.5 35.19468267 2040617.378
Input sub270 B_M 1936 31.70057933 1619374.425
Input sub271 B_M 1991 24.18927567 1456447.913_______________________________________________
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