我有一组包含物种名称和编号（spp_data）的数据，我正在尝试测试物种如何受到不同参数（例如pH，电导率以及下水道位置）的影响（上游/下游）（{env_data1）。
当我尝试运行lm()时，出现以下错误：
lm1 <- lm(specnumber ~ Sewer + pH + Conductivity, data=spp_data,env_data1)
eval（predvars，data，env）中的错误：找不到对象“下水道”
是因为列Sewer是非数字的吗？
我还尝试排除该列并运行lm()，但它不起作用。
summary(spp_data)
Pisidium G_pulex C_pseudo A_aquatic V_pisc
Min. :0.000 Min. : 0.00 Min. : 0.000 Min. :0.0000 Min. :0.00000
1st Qu.:0.000 1st Qu.: 3.00 1st Qu.: 0.000 1st Qu.:0.0000 1st Qu.:0.00000
Median :0.000 Median : 8.00 Median : 3.000 Median :0.0000 Median :0.00000
Mean :1.429 Mean :16.86 Mean : 4.476 Mean :0.5714 Mean :0.04762
3rd Qu.:2.000 3rd Qu.:20.00 3rd Qu.:10.000 3rd Qu.:0.0000 3rd Qu.:0.00000
Max. :7.000 Max. :68.00 Max. :16.000 Max. :4.0000 Max. :1.00000
Taeniopt Rhyacoph Hydropsy Lepidost Glossos
Min. :0.00000 Min. :0.0000 Min. :0.000 Min. :0.000 Min. : 0.00
1st Qu.:0.00000 1st Qu.:0.0000 1st Qu.:0.000 1st Qu.:0.000 1st Qu.: 0.00
Median :0.00000 Median :0.0000 Median :0.000 Median :0.000 Median : 0.00
Mean :0.09524 Mean :0.2381 Mean :1.286 Mean :1.238 Mean : 1.81
3rd Qu.:0.00000 3rd Qu.:0.0000 3rd Qu.:3.000 3rd Qu.:2.000 3rd Qu.: 1.00
Max. :2.00000 Max. :2.0000 Max. :5.000 Max. :7.000 Max. :14.00
Agapetus Hydroptil Limneph S_person Tipula
Min. : 0.0000 Min. :0.00000 Min. :0.000 Min. :0.00000 Min. :0
1st Qu.: 0.0000 1st Qu.:0.00000 1st Qu.:0.000 1st Qu.:0.00000 1st Qu.:0
Median : 0.0000 Median :0.00000 Median :0.000 Median :0.00000 Median :0
Mean : 0.5714 Mean :0.04762 Mean :0.381 Mean :0.09524 Mean :0
3rd Qu.: 0.0000 3rd Qu.:0.00000 3rd Qu.:1.000 3rd Qu.:0.00000 3rd Qu.:0
Max. :12.0000 Max. :1.00000 Max. :2.000 Max. :2.00000 Max. :0
Culicida Ceratopo Simuliid Chrinomi Chrnomus
Min. :0.0000 Min. : 0 Min. : 0.0000 Min. : 0.000 Min. : 0.000
1st Qu.:0.0000 1st Qu.: 0 1st Qu.: 0.0000 1st Qu.: 0.000 1st Qu.: 1.000
Median :0.0000 Median : 1 Median : 0.0000 Median : 2.000 Median : 3.000
Mean :0.5714 Mean : 7 Mean : 0.5238 Mean : 7.286 Mean : 6.095
3rd Qu.:0.0000 3rd Qu.: 8 3rd Qu.: 0.0000 3rd Qu.: 8.000 3rd Qu.: 6.000
Max. :5.0000 Max. :31 Max. :10.0000 Max. :67.000 Max. :41.000
summary(env_data)
Sample Sewer pH Conductivity
Length:21 Length:21 Min. :7.780 Length:21
Class :character Class :character 1st Qu.:7.850 Class :character
Mode :character Mode :character Median :8.100 Mode :character
Mean :8.044
3rd Qu.:8.270
Max. :8.280
Depth %rock %mud %sand,,
Min. : 7.00 Min. :10.00 Min. : 0 Length:21
1st Qu.: 8.00 1st Qu.:10.00 1st Qu.:20 Class :character
Median :11.00 Median :70.00 Median :30 Mode :character
Mean :17.14 Mean :57.14 Mean :40
3rd Qu.:28.00 3rd Qu.:80.00 3rd Qu.:90
Max. :40.00 Max. :90.00 Max. :90