请教大神，
数据表如下：我想通过某个函数得到LotID=ZA001，StepNo分别等于0,1,2时X1到X6列的基本统计值（平均，求和，最大，最小）
LotID=ZA002时，StepNo分别等于0,1,2时X1到X6列的基本统计值（平均，求和，最大，最小）
LotID=ZA003时，StepNo分别等于0,1,2时X1到X6列的基本统计值（平均，求和，最大，最小）
依次类推。

LotID	StepNo	X1	X2	X3	X4	X5	X6
ZA001	0	0.465501285	0.487763653	0.719037439	0.23576238	0.682058296	0.766874996
ZA001	0	0.55303529	0.09806244	0.726654298	0.009856914	0.962413271	0.645640479
ZA001	0	0.849611915	0.555066068	0.431317499	0.065092088	0.574370038	0.286123065
ZA001	1	0.019202528	0.507761538	0.592211001	0.009535094	0.773874135	0.055177349
ZA001	1	0.431183242	0.82696049	0.952844707	0.245440993	0.58027804	0.634213102
ZA001	1	0.659692643	0.86025138	0.897921594	0.099844271	0.604227738	0.655280494
ZA001	1	0.601966592	0.538211843	0.036207162	0.812898158	0.345842086	0.857416012
ZA001	2	0.82201421	0.333103612	0.906336471	0.205029544	0.018779962	0.30513699
ZA001	2	0.998951939	0.784717541	0.928207544	0.192025362	0.924624093	0.949122837
ZA002	0	0.565815577	0.029098459	0.406397238	0.268692156	0.206968225	0.600297808
ZA002	0	0.486466488	0.871490727	0.651695501	0.613242428	0.794405175	0.3288152
ZA002	0	0.290028066	0.975727921	0.161180233	0.144306303	0.951899976	0.282670874
ZA002	1	0.537691812	0.901979879	0.693681103	0.551265738	0.860227495	0.699109571
ZA002	1	0.440955178	0.215437015	0.679133036	0.637750591	0.097810251	0.082782092
ZA002	1	0.498282152	0.916706915	0.769071414	0.162204504	0.008234433	0.870079375
ZA002	1	0.991684453	0.207388589	0.244485754	0.881536492	0.321963142	0.587971864
ZA002	2	0.07820828	0.105941454	0.827982908	0.596016535	0.8814727	0.860772503
ZA002	2	0.753396532	0.052878496	0.163313812	0.968538218	0.200386238	0.321208364
ZA003	0	0.269715871	0.142470263	0.436104477	0.454182864	0.073219736	0.421025734
ZA003	0	0.627816532	0.490206675	0.850011093	0.897276234	0.860121022	0.275395421
ZA003	0	0.110068675	0.774430352	0.849183545	0.064895727	0.741432559	0.123349548
ZA003	1	0.225103129	0.514089073	0.392208039	0.27490946	0.182450211	0.276427218
ZA003	1	0.180353889	0.822386213	0.25058774	0.210108782	0.379106353	0.437415615
ZA003	1	0.561571682	0.356944348	0.965278434	0.714317658	0.998082385	0.212705581
ZA003	1	0.994429611	0.066681061	0.430874229	0.90975871	0.96831891	0.181626353
ZA003	2	0.483526986	0.458792371	0.83486081	0.978257746	0.096337228	0.443090387
ZA003	2	0.913113025	0.034006325	0.133553861	0.933082453	0.972664074	0.368078094